Question

Explain these 2 answers

1. According to the Aufbau principle, what are the values of principal quantum number (n) and angular momentum quantum number (l) for the sub-level that is filled AFTER the 4s orbital?

A. n = 3, l = 2 ​ (Explain Please)

2. The equation represents the electron affinity of nitrogen (N)?

A. N (g) + e⁻ → N⁻ (g)​ (Explain Please)

Answer 1

1. Aufbau principle = the filling of electrons in orbitals takes place from lower energy orbitals to higher energy orbitals.

in energy of orbital depends upon n+l value.

if its same for two orbitals, then higher the n value higher the energy.

so that after 4s orbital electrons enters into 3d orbital.( 4s - orbitral n+l = 4 , 3d - orbital n+l = 5)

2.

A. N (g) + e⁻ ---> N⁻ (g)​

electron affinity = 'the amount of energy released when an electron added to neutral gaseous atom'.