Sistemul periodic al elementelor
Flashcard
•
Chemistry
•
7th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
Ce sunt halogenii?
Back
Halogenii sunt elemente chimice din grupa VII A a sistemului periodic, care au valența I.
2.
FLASHCARD QUESTION
Front
Care este simbolul chimic al sodiului?
Back
Simbolul chimic al sodiului este Na.
3.
FLASHCARD QUESTION
Front
Care este simbolul chimic al potasiului?
Back
Simbolul chimic al potasiului este K.
4.
FLASHCARD QUESTION
Front
Ce este un gaz rar?
Back
Un gaz rar este un element chimic din grupa gazelor nobile, cum ar fi argonul.
5.
FLASHCARD QUESTION
Front
Care este valența hidrogenului?
Back
Valența hidrogenului este I.
6.
FLASHCARD QUESTION
Front
Ce reprezintă valența unui element?
Back
Valența unui element reprezintă capacitatea sa de a forma legături chimice cu alte elemente.
7.
FLASHCARD QUESTION
Front
Care sunt principalele caracteristici ale gazelor nobile?
Back
Gazele nobile sunt inerte, au un nivel de energie complet și nu reacționează ușor cu alte elemente.
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