Neutrons in an atom of Ne-22

Question

how many neutrons are present in an atom of Ne-22?

Answer 1

Find Ne in the periodic table and note that its atomic number is 10.  Subtract its atomic number from the given mass number of 22, and that will be the number of neutrons in its nucleus.

 

22 - 10 = 12

 

Ne²² has 12 neutrons in its nucleus.