An atom has a mass number of 24 and 13 neutrons. What is the atomic number of this atom? Express

A=mass number (protons + neutrons)

Z=atomic number (protons)

N=number of neutrons.

A=Z+N

dа ta:

A=24

N=13

Therefore:

24=Z+13

Z=24-13=11

Answer: The atomic number of this atom is 11. (The element is sodium)