The sum of the atomic masses of all the atoms in a molecule, usually expressed in atomic mass units.
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Learn the basics about why aren't all atomic masses whole numbers? Find out more in this video!

This nugget describes the nucleus of an atom. It talks about the various aspects of a nucleus like atomic number, atomic mass unit, isotopes and isobars, with examples.

It explains Mendeleev's periodic table, modern periodic table, IUPAC names of elements with atomic number > 100

Carry on learning about using moles in this part 2 of 3 parts. Avogradro’s number describes what is known as 1 mole, or 12 g of carbon atoms. This is used in chemical calculations. For any element, the relative atomic mass is the weight...