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GCSE Chemistry · key term
The distribution of an atom's electrons between its occupied electron shells.
Used by OCR
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Periodic Table arrangementIt links an element's identity and position in the table to its electron arrangement.
The distribution of an atom's electrons between its electron shells.
When given an electron arrangement, count the occupied shells for the period, use the outer-shell electrons for the group, and add all the electrons to obtain the atomic number.
Link every stage explicitly: atomic number → electron arrangement → outer-shell electrons → likely electron loss, gain or stability → reaction behaviour.
Write electron arrangements in the correct order from the innermost shell outwards, for example sodium as 2.8.1.
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