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Updated Apr 22, 2026
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Osnovne informacije o Periodnom sistemu elemenata
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Osnove Periodnog sistema
Zaboravi bubanje - Periodni sistem elemenata (PSE) je tvoja mapa za navigaciju kroz svet hemije! Elementi su poređani po atomskom broju (Z), koji predstavlja broj protona u jezgru - to je kao lični broj svakog elementa.
Ključ uspeha leži u razumevanju tri osnovne komponente. Perioda je horizontalni red koji ti govori koliko elektronskih omotača ima atom. Grupa je vertikalna kolona gde svi elementi imaju isti broj valentnih elektrona - zato se ponašaju slično, kao članovi iste porodice!
Valentni elektroni su tvoji najbolji prijatelji u hemiji. Oni se nalaze u spoljašnjem omotaču i odlučuju kako će element reagovati sa drugima. Broj valentnih elektrona možeš lako da odrediš iz broja grupe za glavne grupe (1, 2, 13-18).
Zapamti: Položaj elementa u PSE otkriva skoro sve o njemu - nije potrebno da učiš svojstva svakog elementa ponaosob!
Struktura i organizacija sistema
Navigacija kroz PSE postaje laka kad razumeš da je sve logično organizovano! 7 perioda (redova) ti pokazuje da postoji 7 različitih "spratova" gde mogu da žive elektroni. Natrijum iz 3. periode ima 3 elektronska omotača, dok kalijum iz 4. periode ima 4.
18 grupa (kolona) čini srce sistema. Za glavne grupe, broj grupe direktno govori broj valentnih elektrona: grupa 1 ima 1 valentni elektron, grupa 2 ima 2, grupa 13 ima 3, i tako dalje. Ovo ti omogućava brzu procenu reaktivnosti!
Posebne grupe imaju svoja imena koja moraš znati. Alkalni metali (grupa 1) su ekstremno reaktivni, zemnoalkalni metali (grupa 2) su nešto mirniji, halogeni (grupa 17) su agresivni nemetali, a plemeniti gasovi (grupa 18) su "lenji" jer su već stabilni.
Pro tip: Elementi iste grupe su kao rođaci - imaju slična svojstva jer dele isti broj valentnih elektrona!
Podela elemenata na metale, nemetale i metaloide
Zamišljaj PSE kao grad sa tri različite četvrti! Metali dominiraju levom stranom i sredinom - to su "popularni klinci" koji su sjajni, provode struju i toplotu, mogu se oblikovati. Tu su gvožđe, bakar, zlato koji već poznaješ iz svakodnevnog života.
Nemetali se skupljaju u gornjem desnom uglu kao grupa koja voli privatnost. Oni su potpuna suprotnost metalima - loše provode, nisu sjajni, krhki su. Kiseonik kojim dišeš, ugljenik od kog si napravljen, sumpor - svi su to nemetali.
Metaloidi žive na dijagonalnoj granici između metala i nemetala, kao ljudi koji mogu da se uklapaju u oba društva. Imaju svojstva obe grupe, što ih čini idealnim za elektroniku. Silicijum u tvom telefonu je odličan primer!
Ključna razlika: Metali daju elektrone, nemetali ih uzimaju, a metaloidi mogu i jedno i drugo - zato su toliko korisni!
Praktični primeri analize elemenata
Vreme je za praksu sa kalcijumom (Ca)! Pronađeš ga u 4. periodi i 2. grupi - odmah znaš da ima 4 elektronska omotača i 2 valentna elektrona. Atomski broj 20 znači 20 protona i 20 elektrona. Kao zemnoalkalni metal, reaktivan je i lako otpušta svoja 2 elektrona.
Uporedi litijum (Li) i fluor (F) - oba iz 2. periode, ali totalno različiti! Litijum iz 1. grupe (1 valentni elektron, alkalni metal) voli da daje elektrone, dok fluor iz 17. grupe (7 valentnih elektrona, halogen) očajnički želi da uzme još jedan elektron.
Ova razlika u broju valentnih elektrona objašnjava zašto se litijum i fluor tako privlače - jedan želi da da, drugi da uzme! Litijum postaje Li⁺, fluor postaje F⁻, i nastaje stabilno jedinjenje LiF.
Praktični savet: Kad rešavaš zadatke, uvek počni sa određivanjem periode i grupe - sve ostalo će prirodno da sledi!
Ključne zakonitosti i saveti za uspeh
Vodonik (H) je kao klinac koji ne zna gde pripada - u 1. grupi je, ali je nemetal! Plemeniti gasovi su "lenji" jer već imaju stabilnu konfiguraciju sa 8 elektrona (hellijum ima 2) - zato ne reaguju lako sa drugim elementima.
Zapaziš trend kad se krećeš kroz PSE: idući naniže kroz grupu, metalna svojstva se pojačavaju, a idući udesno kroz periodu, nemetalna svojstva postaju dominantna. Ovo ti pomaže da predvidiš ponašanje elemenata koje nikad nisi učio!
Najveći trik za uspeh je razumevanje da svi elementi teže stabilnosti. Metali je postižu davanjem elektrona, nemetali uzimanjem. Broj valentnih elektrona ti govori koliko je daleko element od svoje "srećne" konfiguracije.
Ne moraš da pamtiš hiljadu podataka - samo razuми logiku PSE-a i ona će raditi za tebe! Periode = omotači, grupe = valentni elektroni, pozicija = svojstva. To je sve što ti treba za početak.
Konačni savet: PSE nije za učenje napamet - to je alat za razumevanje. Koristi ga kao GPS za navigaciju kroz hemiju!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Hemija
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Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Osnovne informacije o Periodnom sistemu elemenata
Periodni sistem elemenata je kao Instagram feed za hemiju - sve je organizovano, lako za pronalaženje, i jednom kad razumeš kako funkcioniše, možeš da predvidiš kako će se svaki element ponašati! Ova genijalna tabela koju je osmislio ruski naučnik Mendeljejev... Show more
Osnove Periodnog sistema
Zaboravi bubanje - Periodni sistem elemenata (PSE) je tvoja mapa za navigaciju kroz svet hemije! Elementi su poređani po atomskom broju (Z), koji predstavlja broj protona u jezgru - to je kao lični broj svakog elementa.
Ključ uspeha leži u razumevanju tri osnovne komponente. Perioda je horizontalni red koji ti govori koliko elektronskih omotača ima atom. Grupa je vertikalna kolona gde svi elementi imaju isti broj valentnih elektrona - zato se ponašaju slično, kao članovi iste porodice!
Valentni elektroni su tvoji najbolji prijatelji u hemiji. Oni se nalaze u spoljašnjem omotaču i odlučuju kako će element reagovati sa drugima. Broj valentnih elektrona možeš lako da odrediš iz broja grupe za glavne grupe (1, 2, 13-18).
Zapamti: Položaj elementa u PSE otkriva skoro sve o njemu - nije potrebno da učiš svojstva svakog elementa ponaosob!
Sign up to see the contentIt's free!
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Struktura i organizacija sistema
Navigacija kroz PSE postaje laka kad razumeš da je sve logično organizovano! 7 perioda (redova) ti pokazuje da postoji 7 različitih "spratova" gde mogu da žive elektroni. Natrijum iz 3. periode ima 3 elektronska omotača, dok kalijum iz 4. periode ima 4.
18 grupa (kolona) čini srce sistema. Za glavne grupe, broj grupe direktno govori broj valentnih elektrona: grupa 1 ima 1 valentni elektron, grupa 2 ima 2, grupa 13 ima 3, i tako dalje. Ovo ti omogućava brzu procenu reaktivnosti!
Posebne grupe imaju svoja imena koja moraš znati. Alkalni metali (grupa 1) su ekstremno reaktivni, zemnoalkalni metali (grupa 2) su nešto mirniji, halogeni (grupa 17) su agresivni nemetali, a plemeniti gasovi (grupa 18) su "lenji" jer su već stabilni.
Pro tip: Elementi iste grupe su kao rođaci - imaju slična svojstva jer dele isti broj valentnih elektrona!
Sign up to see the contentIt's free!
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Improve your grades
Join milions of students
Podela elemenata na metale, nemetale i metaloide
Zamišljaj PSE kao grad sa tri različite četvrti! Metali dominiraju levom stranom i sredinom - to su "popularni klinci" koji su sjajni, provode struju i toplotu, mogu se oblikovati. Tu su gvožđe, bakar, zlato koji već poznaješ iz svakodnevnog života.
Nemetali se skupljaju u gornjem desnom uglu kao grupa koja voli privatnost. Oni su potpuna suprotnost metalima - loše provode, nisu sjajni, krhki su. Kiseonik kojim dišeš, ugljenik od kog si napravljen, sumpor - svi su to nemetali.
Metaloidi žive na dijagonalnoj granici između metala i nemetala, kao ljudi koji mogu da se uklapaju u oba društva. Imaju svojstva obe grupe, što ih čini idealnim za elektroniku. Silicijum u tvom telefonu je odličan primer!
Ključna razlika: Metali daju elektrone, nemetali ih uzimaju, a metaloidi mogu i jedno i drugo - zato su toliko korisni!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Praktični primeri analize elemenata
Vreme je za praksu sa kalcijumom (Ca)! Pronađeš ga u 4. periodi i 2. grupi - odmah znaš da ima 4 elektronska omotača i 2 valentna elektrona. Atomski broj 20 znači 20 protona i 20 elektrona. Kao zemnoalkalni metal, reaktivan je i lako otpušta svoja 2 elektrona.
Uporedi litijum (Li) i fluor (F) - oba iz 2. periode, ali totalno različiti! Litijum iz 1. grupe (1 valentni elektron, alkalni metal) voli da daje elektrone, dok fluor iz 17. grupe (7 valentnih elektrona, halogen) očajnički želi da uzme još jedan elektron.
Ova razlika u broju valentnih elektrona objašnjava zašto se litijum i fluor tako privlače - jedan želi da da, drugi da uzme! Litijum postaje Li⁺, fluor postaje F⁻, i nastaje stabilno jedinjenje LiF.
Praktični savet: Kad rešavaš zadatke, uvek počni sa određivanjem periode i grupe - sve ostalo će prirodno da sledi!
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Ključne zakonitosti i saveti za uspeh
Vodonik (H) je kao klinac koji ne zna gde pripada - u 1. grupi je, ali je nemetal! Plemeniti gasovi su "lenji" jer već imaju stabilnu konfiguraciju sa 8 elektrona (hellijum ima 2) - zato ne reaguju lako sa drugim elementima.
Zapaziš trend kad se krećeš kroz PSE: idući naniže kroz grupu, metalna svojstva se pojačavaju, a idući udesno kroz periodu, nemetalna svojstva postaju dominantna. Ovo ti pomaže da predvidiš ponašanje elemenata koje nikad nisi učio!
Najveći trik za uspeh je razumevanje da svi elementi teže stabilnosti. Metali je postižu davanjem elektrona, nemetali uzimanjem. Broj valentnih elektrona ti govori koliko je daleko element od svoje "srećne" konfiguracije.
Ne moraš da pamtiš hiljadu podataka - samo razuми logiku PSE-a i ona će raditi za tebe! Periode = omotači, grupe = valentni elektroni, pozicija = svojstva. To je sve što ti treba za početak.
Konačni savet: PSE nije za učenje napamet - to je alat za razumevanje. Koristi ga kao GPS za navigaciju kroz hemiju!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user