How many neutrons does element x have if its atomic number is 22 and its mass number is 84?

To find the number of neutrons in an element, you subtract the atomic number from the mass number. For element X with an atomic number of 22 and a mass number of 84, the calculation is as follows: 84 (mass number) - 22 (atomic number) = 62 neutrons. Therefore, element X has 62 neutrons.