Question

Complete the chart:

Name of the element	Symbol of the element	Atomic number	Mass number	No. of protons	No. of electrons	No. of neutrons	Electronic configuration
Sodium	Na	11	23		11		K	L	M

Answer 1

Identify the symbol of Sodium:

The chemical symbol of Sodium is $\mathrm{Na}$.

Calculate the number of protons in Sodium:

Number of protons$=$Atomic number

Thus,

Number of protons$=11$

Calculate the number of neutrons in Sodium:

Mass number$=$Number of protons$+$Number of neutrons

Thus,

Number of neutrons$=$Mass number$-$Number of protons

Number of neutrons$=23-11=12$

Write the electronic configuration for Sodium:

1. The number of electrons in Sodium are $11$.
2. The first $\mathrm{K}$ shell occupies $2$ electrons, second $\mathrm{L}$ shell occupies $8$ electrons and the remaining $1$ electron goes to the third $\mathrm{M}$ shell.
3. Thus, the electronic configuration of Sodium is $\mathrm{K}=2$, $\mathrm{L}=8$ and $\mathrm{M}=1$.

Thus, the chart is as follows:

Name of the element	Symbol of the element	Atomic number	Mass number	No. of protons	No. of electrons	No. of neutrons	Electronic configuration
Sodium	$\mathrm{Na}$	11	23	11	11	12	$\mathrm{K}=2$	$\mathrm{L}=8$	$\mathrm{M}=1$