Question

For al, its atomic number is 13 and its mass number is 27. how many neutrons does it have

Answer 1

i believe it would have 14

Answer 2

Atomic number is the same number as the amount of protons. Atomic mass is the sum of protons and neutrons: the two sub-atomic particles only found in the atomic nucleus. Number of neutrons is equal to atomic mass (z) - atomic number (n), so 27-13=14 neutrons