Question

Zirconium has an atomic number of 40 and an atomic mass of 91. How many neutrons does it have?

Answer 1

51 neutrons

Explanation:

The atomic mass of an element can be determined by adding the protons and the neutrons.

`P + N = AM`

`N = AM -P`

`N = 91^(am) - 40^+`

`N = 51`