Question

How many neutrons are present in the nucleus of a phosphorus atom

Answer 1

16 neutrons are present in the most abundant isotope...
Because the Phosphorus has 18 isotopes. The most common isotope has mass number (no. of protons 15+ no. of neutrons 16=) 31 .

Answer 2

16 neutrons are present in the most abundant isotope.

Explanation:

Phosphorus has 18 isotopes. The most common isotope has mass number (no. of protons 15+ no. of neutrons 16=) 31 .