Question

The mass number of a nucleus is -

• A. Always less then its atomic number
• B. Always more than its atomic number
• C. Sometimesless and some times more thanitsatomicnumber
• D. Sometimesequaltoitsatomicnumber.

Answer 1

Answer: (D)

Sometimesequaltoitsatomicnumber.

Answer 2

e.g. ${}_{1}^{1}H$