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  4. Halogens exist in -1,+ text 1,+3,+5 and +7 oxidation states. The halogen that exists only in -1 state is

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Q. Halogens exist in $ -1,+\text{ }1,+3,+5 $ and +7 oxidation states. The halogen that exists only in $ -1 $ state is

KEAMKEAM 2010The p-Block Elements - Part2

Solution:

Fluorine atom has no d-orbitals in its valence shell, therefore cannot expand its octet and thus, does not exhibit variable oxidation states. Being the most electronegative, it exhibits only -1 oxidation state.