Alkali metals show-
(A) Only +1 oxidation state
(B) Only –1 oxidation state
(C) +1 and +2 oxidation states
(D) –1 and –2 oxidation states.
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(A). Due to their low ionisation energies, these elements can easily form the univalent ions (ions) by losing the single electron. Since the unipositive ions have the stable noble gas configuration in the valence shell, the energy required to pull out another electron from the valence shell is very high i.e. the second ionisation energies of these metals are very high. Therefore, under
ordinary conditions, it is not possible for the metals to form ions. Therefore, they show only +1 oxidation state.