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Fluorine exhibits only -1 oxidation stat...

Fluorine exhibits only -1 oxidation state whereas other halogens show +1, +3, +5 and +7 oxidation states also. Explain.

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(i) Fluorine has electronic configuration ,`""_(9)F 1s^(2) 2s^(2) 2p^(5)`.
(ii) Halogens have outer electronic configuration `ns^(2)np^(5)nd^(0)`.
(iii) Halogens have tendency to gain or share one electron to attain the stable configuration of nearest inert element with configuration `ns^(2) np^(6)`.
(iv) Hence they are monovalent and show oxidation state -1.
(v) Due to vacant d-orbitals, halogens show higher oxidation states +1, +3, +5 and +7. But since fluorine does not have vacant d-orbitals, it shows only one oxidation state - 1.
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