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A numeral, a lowercase letter and a raised count, repeated.
Also known as: Electronic configuration, Orbital notation, 1s2 2s2 notation, Subshell notation
1s²2s²2p⁶ lists which orbitals hold how many electrons. The order written is not the order the orbitals fill — 4s fills before 3d but is written after it — which is why configurations are conventionally listed by shell rather than by energy.
Denotes the distribution of an atom's electrons across its orbitals: shell number, subshell letter, and a superscript occupancy count.
Contexts: Laboratory
Is conventionally written in order of shell rather than of filling energy, so 3d appears before 4s despite 4s filling first.
Contexts: Laboratory
Is abbreviated using a bracketed noble gas symbol for the filled inner shells, which is a shorthand rather than a different claim.
Contexts: Laboratory
A sequence of groups, each a numeral followed by a lowercase letter s, p, d or f and a small raised numeral.