Ncert Exercises & Solutions

An atom having atomic mass number 13 has 7 neutrons. What is the atomic number of the atom?

An atom having atomic mass number 13 and number of neutrons 7.

i.e.,

A = 13, n = 7

As we know that,

A = n + p

∴ p = A - n = 13 - 7 = 6

Hence,

Z = p = 6