<span>17 protons and 20 neutrons add up to a molecular mass of 37</span>
(n+1)x 2=10
2n+2=10
2n=8
n=4
To do this, first, find the decimal of 1/3. You will divide 1 by 3. This equals .333333333(goes on forever). Put a repeating bar over the first 3 to show that it goes on forever (put this: - over the .3) Now divide to find out how much you will need to subtract by. 960*33.3(with - over .3)=28.8. Subtract 28.8 from 960 (960-28.8=931.2) 931.2 is the answer.
