Atomic hydrogen combines with almost all elements but molecular hydrog

1.	Atomic hydrogen combines with almost all elements but molecular hydrogen does not. Explain.
Answer» Solution :Atomic hydrogen is highly unstable and hence it is very reactive. Its electronic configuration is `1s^1`. For stability it ACCEPT 1 more electron and thus it almost COMBINE with all the elements. Atomic hydrogen make hydride by THREE different type. (i) If remove one electron and FORM `H^+` (ii) It accept one electron and form `H^-` (iii) It share one electron and form covalent single bond. In contrast, the bond dissocia tion energy of H-H bond is very high (435.88 kJ `"mol"^(-1)`). As a result molecular hy drogen is almost inert at room TEMP. and hence reacts only with a few elements.

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