Helas, you can not. Just look it up in a proper (periodic) table on ISOTOPES grouped per element. Most commonly the number of neutrons is larger or equal to the number of protons, except for Hygrogen (p=1, n=0).
How many neutrons would it have if it had 11 neutrons? 11.
18 neutrons
117 neutrons.
There is no neutrons in Hitrogen.
It has 20 neutrons.
61 neutrons 47 protons and 47 neutrons
30 neutrons for Na35Cl and 32 neutrons for Na37Cl .
106 neutrons
How many neutrons are in Cesium-130 (Cs)?
45 neutrons
61 neutrons
20 neutrons.