atomic structure

Question 1

Predict with explanation, the group where Element R is found in & complete electronic configuration. (principal quantum number: n)

Answer 1

1. calculate largest energy diff. (eg. btw 6th & 7th I.E)
2. 7th e- to be removed is found in the inner shell
3. R has 6 e-

group 16, ns2np6

Question 2

explain why (sulfur) has a lower IE than (phosphorus) [1]

Answer 2

1. less energy is required to remove a paired 3p e- in (_)
2. than an unpaired 3p e- in (_)
3. due to inter-electronic repulsion