2.1.1 Flashcards
1
Q
What shells do electrons occupy first
A
Lowest energy levels
2
Q
What can first 3 energy levels hold
A
1st - 2
2nd - 8
3rd - 18
3
Q
What’s an elements group number the same as
A
Number of outer shell electrons
4
Q
How many electrons does a halogen have in its outer shell
A
7
