How does the mole relate to atoms, molecules and ions?
A mole is simply a quantity of
One mole of atoms of an element has a mass equivalent to the 'mass number' (now sometimes called 'nucleon number') of that element, e.g. 1 mole of
Technically it's slightly more complex than the answer above, because different isotopes have different mass numbers and abundances.
Carbon is mostly
On the other hand, naturally occurring chlorine is about