Loading…
Loading…
GCSE Chemistry · key term
An electron in the outermost occupied electron shell of an atom; these electrons can take part in bonding.
Used by AQA, Edexcel and OCR
Specification 4.1.2.1, 4.1.2.5 · Paper 1
An electron in the highest occupied energy level of an atom.
Revise: Periodic Table OrganizationGroup 1 atoms have one outer-shell electron.
An electron in the highest occupied energy level of an atom; these electrons have the greatest influence on its chemical behaviour.
Specification 1.18, 1.20, 1.24, 1.28 · Paper 1, Paper 2
An electron in the highest occupied electron shell of an atom; outer-shell electrons take part in chemical reactions and bonding.
Revise: Metals and Non-metalsFor the main-group elements in Periods 2 and 3, moving from Group 1 towards Group 7 adds one outer-shell electron at each step: Group 1 atoms have one, Group 2 atoms have two, and Group 7 atoms have seven. This provides a clear model for the change from metallic to non-metallic behaviour across these periods.
An electron in an atom's outermost occupied shell; these electrons strongly influence the element's chemical behaviour.
An electron in the highest occupied energy level, or outer shell, of an atom.
Specification C2.2f, C2.3a · Paper 1 (Foundation), Paper 3 (Higher)
An electron in an atom's outer occupied shell that can be transferred or shared during bonding.
Revise: Dot and Cross DiagramsIn most such diagrams, only outer-shell electrons are drawn.
An electron in the highest occupied energy level of an atom; these electrons take part in bonding.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
An electron in the highest occupied electron shell of an atom; these electrons take part in covalent bonding.
An electron in an atom's outermost occupied shell that can take part in bonding.
Do not swap the meanings of group and period: for the main groups, outer-shell electrons indicate the group, while occupied shells indicate the period.
Elements in the same group do not have identical electronic structures; they have the same number of outer-shell electrons.
Do not say that Group 1 atoms gain an electron. They lose their one outer-shell electron and form ions with a charge.
Create a free account to read GCSE Chemistry revision notes for your exam board and track your progress.