The "210" is the mass number. The mass number is the sum of the number of neutrons and the number of protons. So if you can locate a Periodic Table, you can see that lead's atomic number of 82, which means it has 82 protons. If you do a little subtraction (210-82), you can find the number of neutrons in this particular isotope, which is 128.
How many neutrons would it have if it had 11 neutrons? 11.
There is no neutrons in Hitrogen.
It has 20 neutrons.
18 neutrons
117 neutrons.
61 neutrons 47 protons and 47 neutrons
106 neutrons
30 neutrons for Na35Cl and 32 neutrons for Na37Cl .
How many neutrons are in Cesium-130 (Cs)?
45 neutrons
61 neutrons
20 neutrons.