Question

If xenon has an atomic number of 54 and a mass number of 108, how many neutrons does it have?

Answer 1

There are 54 neutrons in a xenon-108 atom.

Explanation:

Subtract the atomic number from the mass number. The atomic number is the number of protons in the nucleus of the atom, and the mass number is the sum of the protons and neutrons in the nucleus of an atom. Isotopes are named for their mass numbers. The name of this isotope is xenon-108 or Xe-108.

`108-54=54`

There are 54 neutrons in a xenon-108 atom.