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Shells

TermDefinition
First Ionisation energy The energy required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions
electron shielding the repulsion between electrons in different inner shells. Shielding reduces the net attractive force from the positive nucleus on the outer shell electrons
successive ionisation energy A measure of the energy required to remove each electron in turn.
Shell A group of atomic orbitals with the same principal quantum
Principal quantum number A number representing the relative overall energy of each orbital which increases with distance from the nucleus
atomic orbital A region within an atom that can hold up to two electrons with opposite spins
Sub-shell A group of the same type of atomic prbitals within a shell
electron configuration The arrangement of electrons in an atom
Created by: stu035847