U1S1 electronic structure Flashcards
1
Q
When does a shell have a higher energy level
A
- when its further away from the nucleus
2
Q
What are shells divided into
A
- subshells
- s, p, d and f
3
Q
How many electrons can each sub-shell hold
A
- two
4
Q
How can you show electron configuration
A
- sub-shell notation
- arrows in boxes
- energy level diagrams
5
Q
Why does the 4s shell fill up before 3d
A
- has a lower energy level
6
Q
What are the rules for working out electron configurations
A
- electrons fill up the lowest energy sub-shells first
- electrons fill orbitals in a sub-shell singly before sharing
7
Q
Why are copper and chromium badly behaved
A
- donate one of their 4s electrons to the 3d sub shell
- happier with a more stable full or half full d subshell
8
Q
What happens when a transition metal becomes an ion
A
- loses from 4s sub-shell before 3d
