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the claim

The shorthand electron configuration of Br- is [Kr]

the verdict
COMMON KNOWLEDGE
Legacy classification; evidence review pending
Recorded sources
no sources on either side

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Is it true that the shorthand electron configuration of Br- is [Kr]?

The bromide anion (Br-) has 36 electrons, giving it the same electron configuration as the noble gas krypton ([Kr]), making this a matter of elementary definition.

Verdict: COMMON KNOWLEDGE · 0 sources for, 0 against · Last checked

The analysis

The claim asks for the shorthand electron configuration of the bromide ion (Br-). A neutral bromine atom has atomic number 35 (configuration [Ar] 3d10 4s2 4p5 or shorthand [Ar] 3d10 4s2 4p5, full 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5). Adding one electron to form Br- results in 36 electrons, matching the noble gas krypton ([Kr]). This is a fundamental, textbook chemistry fact (common knowledge) requiring no empirical citation. None of the retrieved papers discuss the electron configuration of Br- directly, as they focus on perovskites, catalysis, and organic synthesis.

What does the evidence say?

The claim asks for the shorthand electron configuration of the bromide ion (Br-). A neutral bromine atom has atomic number 35 (configuration [Ar] 3d10 4s2 4p5 or shorthand [Ar] 3d10 4s2 4p5, full 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5). Adding one electron to form Br- results in 36 electrons, matching the noble gas krypton ([Kr]). This is a fundamental, textbook chemistry fact (common knowledge) requiring no empirical citation. None of the retrieved papers discuss the electron configuration of Br- directly, as they focus on perovskites, catalysis, and organic synthesis.

Receipt History
first checked05 Aug 2026
judged → COMMON KNOWLEDGE · 9505 Aug 2026
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