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

52

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:

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!

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Neutrons = Mass number - Atomic number Neutrons = 92 - 40 Neutrons = 52 To find the number of neutrons in an isotope of zirconium-92, subtract the atomic number (40) from the mass number (92).

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