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
Phosphorous		15	31		15

Answer 1

Identify the chemical symbol of Phosphorous:

The chemical symbol of Phosphorous is $\mathrm{P}$.

Determine the number of protons of phosphorous:

Atomic number = number of protons

Thus,

Number of protons = 15

Determine the number of neutrons:

Mass number = Number of protons + Number of neutrons

Number of neutrons = Mass number - Number of protons$=31-15=16$

Write the electronic configuration for Phosphorous:

1. The number of electrons in Phosphorous is 15.

2. The first K shell occupies 2 electrons and the remaining 8 electrons go to the second L shell and 5 to the M shell.

3. Thus, the electronic configuration of carbon is K=2, L=8 and M=5.

Name of the element	Symbol of the element	Atomic number	Mass number	No. of protons	No. of electrons	No. of neutrons	Electronic configuration
Phosphorous	P	15	31	15	15	16	K = 2	L = 8	M = 5