Question

The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element ?
A. `overset(31)underset(15)X`
B. `overset(31)underset(16)X`
C. `overset(16)underset(15)X`
D. `overset(15)underset(16)X`

Answer 1

Correct Answer - a
correct answer a Mass no = o of electrons (protons)+no of neutrons
=15+16=31