In the previous expression, we appreciate that the mass is directly proportional to the moles; therefore, if the mass of the sample increases, its number of moles will also increase, since the molecular weight is always constant.
The first shell can hold up to 2 electrons, the second shell can hold up to 8 (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on.
