Question

Write the electronic arrangement for :
Magnesium $(\mathrm{atomic}\mathrm{mass}=24,\mathrm{atomic}\mathrm{number}=12)$

Answer 1

Magnesium:

1. Magnesium is a chemical element and is denoted as $\mathrm{Mg}$.
2. The atomic number of Magnesium is 12 $(\mathrm{Z}=12)$.
3. Thus, the distribution of electrons is $2,8,2$.
4. This means that 2 electrons are present in the K shell, 8 electrons in the L shell, and 2 electrons in the M shell.

Hence, the electronic arrangement for Magnesium is $2,8,2$.