Question #159f6
1 Answer
Jul 17, 2014
The mass of any atom is the sum of the number of protons and neutrons. The mass of a proton is 1 amu and the mass of a neutron is also 1 amu. So the number of neutrons in radium is 138.
How do we find this
226 - 88 = 138
How do you check your answer? Add the mass of protons and neutrons, it should equal the mass number.
138 amu (neutrons) + 88 amu (protons) = 226 amu
The actual mass of protons is slightly different, I mean it's a tiny difference. So small you shouldn't even keep reading...
Noel P.
