In which of the following properties hydrogen does not shown similalrity with alkali metals ? (a...

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In which of the following properties hydrogen does not shown similalrity with alkali metals ?
(a) Electropositive character
(b) Reducing nature
\( \mathrm{P} \)
(c) Electronic configuration \( \left(n s^{1}\right) \)
(d) diatomic nature of molecule
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