GCSE SCIENCE CHEMISTRY HIGH SCHOOL - Mole - Definition - Relative Atomic Mass - Carbon - Moles

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A mole is defined as
the number of atoms in exactly 12 grams of ¹²C (carbon twelve).
The number is called Avogadro's Number.

In the above definition, 12 is the mass number of carbon.
So, one mole of carbon atoms has a mass of 12 grams.

The relative atomic mass, which can be written as A_r or RAM,
is the number just above the element in the periodic table
(have a look, and check that carbon is 12).
If you don't know what "relative atomic mass" means,
see relative atomic mass in the atomic structure section.

What about elements other than carbon?

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