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Key words you need to know
Relative Atomic Mass
The average mass of the atoms of that element compared to the mass of one twelfth of a carbon-12 atom
Relative Isotopic Mass
The mass of an atom of an isotope of the element compared to one twelfth of a carbon-12 atom
Hunds Rule
Electrons will occupy P-orbitals singly before paring takes place
First ionisation energy
The energy required to remove one mole of electrons from one mole of gaseous atoms to form one mole of gaseous positive ions
Isoelectric ions
Ions that have the same number of electrons
Periodicity
Regular repeating patterns across a period
