A-level Chem Key Definitions

Relative Isotopic mass

The weighted mean mass of an elements atoms compared to one twelfth of the mass of a carbon-12 atom

What is avagadros constant?

6.02214076 × 10²³

Relative Isotopic Mass

The mass of an isotope compared to one twelfth of the mass of a carbon-12 atom

What elements have abnormal electron configurations and why?

Chromium and Copper - an atom/ion is most stable when when sub shells are all half-filled or fully filled

What’s the definition of a mole?

The amount of any substance that contains exactly 6.02214076 × 10^{23 particles}