Question

An atom of aluminum has an atomic number of 13 and a mass number of 27. How many neutrons does it have?

Answer 1

There are 14 neutrons in Aluminum.

Here's Why:

To find the amount of neutrons in any atom, you subtract the mass number by the atomic number. So, for this particular atom, you'd do 27 - 13. What do you get--? 14!