Question

3) If atom ‘A’ has mass number 31 and atomic number 15. State the number of neutrons in it.​

Answer 1

Answer:

no of neutrons = 16

Explanation:

Atomic number=the number of protons found in the nucleus of every atom of that element

no of protons=15

Mass number= no of protons + no of neutrons

31=15+n

no of neutrons = 16

Answer 2

Answer:

So, this element has 15 protons (atomic number), 15 electrons, and 16 neutrons (mass number minus atomic number). This isotope is phosphorus-31, which has atomic number 15.