Question

B the atomic number of nitrogen is 7. what is the mass number of a nitrogen atom with 6 neutrons? express your answer as an integer.

Answer 1

Mass number is equal to the sum of number of neutrons (neutral subatomic particle) and number of protons (positively charge particle).

Mass number  =$number of protons + number of neutrons$

Now, atomic number is same as the number of protons i.e. atomic of nitrogen is 7 . Thus, number of protons is also equal to 7.

Therefore,

Mass number  =$7 + 6$

= $13$

Hence, mass number of nitrogen is equal to $13$.