Question

The number of protons, electrons and neutrons in the nucleus of ${}_{13}A{l}^{27}$ is

• A. 13, 13, 14
• B. 13, 0, 14
• C. 14,14, 13
• D. 14, 0, 13

Answer 1

Answer: (B)

13, 0, 14

${}_{13}A{l}^{27}$

Atomic mass $=27$
Atomic number $=13$
So, proton $=13$
neutron $=27-13=14$
electron $=13$

But, there are only proton and neutron in the nucleus.
So (B) $\to 13,0,14$