00:01
To determine the mass defect, we take the mass of the nitrogen 14 isotope, which is provided at 14 .003 -07 amu, and we subtract off the sum mass of all of its components.
00:22
Because it's nitrogen, nitrogen is element 7.
00:26
It has 7 protons, so it'll be 7 times the mass, of a proton, which they give to us as 1 .007277.
00:43
Plus, because it's neutral, it has seven electrons.
00:47
They give us the mass of an electron to be 5 .485 times 10 to the negative 4 amu.
00:57
And then with a mass of a mass number of 14, and seven of those 14 are protons.
01:08
The other seven are neutrons...