Question

Calculate effective nuclear charge for 3S electron of
Magnesium​

Answer 1

Answer:

the correct ans is:

+2

Explanation:

nuclear charge = +12

1s, 2s, & 2p electrons = 10

+12-10 = 2 for the effective nuclear charge on the two 3s outside electrons

Answer 2

Given:

3s orbital of Magnesium

To Find:

Effective nuclear charge of 3s electron of Magnesium.

Solution:

The effective nuclear charge on any orbital can be measured by knowing the electronic configuration of the element.

Knowing that the atomic number of Mg is 12,

We can write its electronic configuration as-

2,8,2.

This means that 1s, 2s and 2p orbitals contain 2, 2 and 6 electrons respectively. The valence orbital 3s will then have 2 electrons.

The effective nuclear charge is-

Nuclear charge on all electrons - nuclear charge on electrons in K and L shells.

> +12 - (+10) = +2

Hence, the effective nuclear charge on the 3s electrons of Magnesium is +2.