Electrons Shells Flashcards
(7 cards)
1
Q
What do electrons occupy energy levels called?
A
Shells
2
Q
What does the lowest energy level or the innermost shell do?
A
Fills with electrons first
3
Q
How many electrons can the first shell hold?
A
2 electrons
4
Q
How many electrons can the second shell hold?
A
8 electrons
5
Q
How many electrons does the third shell hold?
A
Can hold up to 18 electrons but for the first 20 elements it will not have more then 8 electrons
6
Q
How is the element’s reactivity is determined?
A
It is determined by the number of electrons in which in the outer shell of its atom
7
Q
How can an atom be perfectly stable
A
To be perfectly stable an atom requires a full outer shell of electrons
