Question

Q. 28. A molecule of ammonia has the formula NH3. Predict the total number
of bonds present around nitrogen atom.
[CBSE 2016]​

Answer 1

a molecular formula of ammonia is NH3

Answer 2

Answer:

A molecule of ammonia has the formula $NH_3$. The total number

of bonds present around the nitrogen atom are three covalent bonds.

Explanation:

• The atomic number of Nitrogen is 7.
• The nitrogen has five valence electrons and gets three more electrons from three hydrogen atoms to complete its octet.
• It leaves a lone electron pair on nitrogen that is not bonded to any other atom andis  freely available for binding.
• Nitrogen atom has 5 valence electrons and Hydrogen atom has 1 valence electron. So, in $NH_3$ molecule, three covalent bonds are present.