00:01
When we talk about elements which are given in the questions are carbon element, then comes chromium, then comes magnesium and sodium as well.
00:18
Right? their atomic numbers are given here.
00:23
Atomic numbers for carbon, the atomic number is 6, chromium 24, magnesium 12 and sodium, it's going to be 11.
00:32
So their masses are also given for carbon, the mass is 12, for chromium masses 52, magnesium 24 and sodium 23.
00:42
Now we have learned about one thing in our chemistry section that when we talk about atomic numbers, atomic number is equals to number of electrons.
01:00
There is a condition for this that needs to be atom, needs to be neutral in that case.
01:11
Not always atomic number is equals to number of electron, but atomic number is equals to number of protons always...