Question

The sum of the number of neutrons and protons in the three isotopes of hydrogen ${(}^{1}H{,}^{2}H{,}^{3}H)$ is:

• A. 6
• B. 5
• C. 4
• D. 3

Answer 1

The correct option is A 6

Isotopes of Hydrogen are: ${}_1^{1}H{,}_1^{2}H{,}_1^{3}H$

Symbol	Neutrons	Protons
${}_1^{1}H$	0	1
${}_1^{2}H$	1	1
${}_1^{3}H$	2	1
Sum	3	3

Therefore, sum of neutrons and protons in the isotopes of hydrogen = 6