Question

how many neutrons are in the nucleus of an atom that has an atomic mass of 36 and an atomic number of 25

Answer 1

Hey mate
It has 11 neutrons

Answer 2

atomic mass = no. of protons + no. of neutrons

atomic no. = no. of protons

Here, atomic mass no. is 36 and atomic no. is 25

so, atomic mass = no. of neutrons + atomic no.

that is, 36  = no. fo neutrons + 25

           36 - 25 = 11

so the no. of neutrons is 11.