The formula to solve for the number of neutronons?

Answer 1

Do you mean 'neutrons'.

To find the number of neutrons in an isotope of an element.

Then it is

Atomic Mass - Atomic number = number of neutrons.

For any element in the Periodic Table, two numbers are quoted viz., Atomic Mass and Atomic No.(Z). In a shorthand manner these are shown as [14/6]C

This is the Carbon =14 isotope of carbon. shown as [14/6]C

So atomic mass is 14

Atomic Number is 6

No of neutrons is 14 - 6 = 8

Here is another example Uranium 236 ; [236/92]U

Atomic mass is 236

Atomic Npo. 92

Number of neutrons is 236 - 92 = 144

Hope that helps!!!!

Answer 2

Not sure about neutrons, while the answer for neutrons will depend on what information is available. The atomic mass, the angular deflection of the nucleus as it passes through a magnetic field, etc.