Question

What rules and principles are violated in the following electronic configuration? Also write correct configuration:
1) 1s2 2s3
2) 1s2 2p2
3) 1s2 2s2 2p6 3s2 3p6 3p4 4s3
4) 3s2 3px2 3py1 3pz0

Answer 1

1-s she'll contains 2e-s

2-after 1s it is 2s, moellar diagram

3-After 3p again 3p won't come

4-we should start from 1s