Question

Full solution to find z effective of magnesium

Answer 1

Explanation:

Approximate the effective nuclear charge of magnesium. ... Mg =1s2 2s2 2p6 3s2 = [Ne]3s2, therefore magnesium has 10 core electrons from its 1s2, 2s2, 2p6 orbitals. Magnesium is element 12, so it has 12 protons and a nuclear charge of 12.

Answer 2

Answer: 2.85

Explanation:

Mg(atomic number 12)

EC: 1s^2 2s^2 2p^6 3s^2

grouping according to Slater rules

(1s)^2 (2s2p)^8 3s^2

screening constant = 1×0.35 + 8×0.85 + 2×1 = 9.15

effective Nuclear charge= 12-9.15 = 2.85