Abbreviated electron
configuration
•
2
He
1s
2
•
10
Ne
1s
2
2s
2
2p
6
•
18
Ar
1s
2
2s
2
2p
6
3s
2
3p
6
•
36
Kr
1s
2
2s
2
2p
6
3s
2
3p
6
4s
2
3d
10
4p
6
•
These configurations are for ground state
configurations--lowest energy.