Question

which halogen always show oxidation state -1

Answer 1

Fluorine.

Hope it helps you.....

Answer 2

Actually all the halogens have 7electrons in their valence shell

it means they require only one electron to complete their octet

that's why their oxidation state is-1

however when some more electronegative elements combine with them then their O.S became positive bcoz in that case they r forced to donate electron

All halogens can have positive ON except flourine bcozit is most electronegative

so ur answer is flourine

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