# Zirconium has an atomic number of 40. How many neutrons are there in an isotope of zirconium-92?

Mar 30, 2017

52

#### Explanation:

To determine the number of neutrons that zirconium-92 has we will use the formula below:

We know the atomic number (40) and we know the atomic mass (92), so all we have to do is plug the numbers into the equation and solve for N:

$N = 92 - 40 = 52$

There are 52 neutrons in the isotope Zr-92

*I should also mention that the number to the right of the element's name is the atomic mass.

I hope this helps!