Question

Name of the element	Symbol of the element	Atomic number	Mass number	No. of protons	No. of electrons	No. of neutrons	Electronic configuration
Lithium		3

Answer 1

Identify the chemical symbol of Lithium:

The chemical symbol of Lithium is $\mathrm{Li}$.

Identify the number of electrons and protons in Lithium:

Atomic number$=$Number of electrons$=$Number of protons

Thus,

Number of electrons$=3$

Number of protons$=3$

Calculate number of neutrons in Lithium:

Number of neutrons$=4$

Calculate mass number of Lithium:

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

Mass number$=3+4=7$

Write the electronic configuration of Lithium:

1. The number of electrons in Lithium are $3$.
2. The first two electrons will occupy K shell and then the remaining one electron will go to the L shell.
3. Thus, the electronic configuration of Lithium is K=2, L=1.

Thus, the table 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
Lithium	$\mathrm{Li}$	3	7	3	3	4	K=2	L=1