Question

What is the electronic configuration of nitrogen [Atomic number=7, Atomic mass =14]?
(A) 2,3
(B) 2,5
(C) 2,2
(D) 7

Answer 1

Hint: Electron configuration is $ 1{{\text{s}}^{2}}2{{\text{s}}^{2}}\text{2}{{\text{p}}^{6}}3{{\text{s}}^{2}}3{{\text{p}}^{6}}4{{\text{s}}^{2}}3{{\text{d}}^{10}} $
Nitrogen is important to the chemical industry. It is used to make fertilizer, nitric acid, nylon, dyes and explosives. To make these products, nitrogen must first be reacted with hydrogen to produce ammonia. Symbol :N And atomic mass is 14.0067, atomic number is 7

Complete step by step solution
Nitrogen atomic number is 7
And atomic mass is 14
 $ 1{{\text{s}}^{2}}2{{\text{s}}^{2}}\text{2}{{\text{p}}^{3}} $ Electronic configuration
Nitrogen has 5 valence shell electrons, out of them only 3 electrons are used in bond formation and 2 s electrons remain the same.
So option B correct option .

Addition Information
Nitrogen is found naturally in some mineral deposits, in the soils and in organic compounds. Nitrogen is usually prepared by removing the oxygen from air, but it also can be formed from some chemical reactions
 $ {{\text{N}}_{2}}+{{\text{O}}_{2}}\to 2\text{NO} $
 $ {{\text{N}}_{2}}+3{{\text{H}}_{2}}\to 2\text{N}{{\text{H}}_{3}} $
Properties of Nitrogen:
Nitrogen gas is generally inert
-Nonmetallic
-Colorless
-Odorless
-Tasteless
-Atomic number is 7
-Atomic weight is 14.0067
Nitrogen makes up around 78% of the air you breathe.
Nitrogen is present in all living things, including the human body and plants.

Note
To calculate an electron configuration, divide the periodic table into sections to represent the atomic orbitals , the regions where electron are contained Groups one and two are the s- block, three Through 12 represent the d- block, 13 to 18 are the p-block and the two rows at the bottom are the f-block.