Question

A nucleus of stable phosphorus has $15$ protons and $16$ neutrons. The nucleus of radio phosphorus has one neutron more than the stable nucleus. What will be its atomic number and mass number ?

• A. $15,31$
• B. $16,32$
• C. $15,32$
• D. $32,32$

Answer 1

The correct option is C $15,32$

Atomic number is equal to number of proton $=15$

Total number of neutron $=16+1=17$

Atomic number $=15+17=32$