Question

The atomic number of sodium is 11.

How many neutrons are in an atom of sodium with mass number 23?

Answer 1

$\huge \bold \color {magenta}{Answer :}$

There are 12 neutrons in sodium.

Answer 2

proton= atomic number

mass number = proton + neutrons

23 = 11+ neutrons

23-11= neutrons

neutron = 12