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Question

Write the similarities of hydrogen with halogens.

Solution
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There are following similarities of hydrogen halogens:
(i) Electronic Configuration:
Electronic configuration of hydrogen $$=1s^1$$
general electronic configuration of halogens $$=ns^2 np^5$$
i.e. Hydrogen requires one electron to attain noble gas configuration. Similarly halogens also require one electrons to attain noble gas configuration.
(ii) Electronegative Nature: Hydrogen has tendency to attract electrons like halogens.
e.e., $$H+e^- \to H^-$$ (hydride ion)
$$Cl + e^- \to Cl^-$$ (chlorine ion)
(ii) Oxidation number: In addition to oxidation state of $$+1$$ hydrogen shows oxidation state of $$-1$$ like halogens in some of its compounds
e.g., $$NaH$$ (Oxidation state of $$H=-1$$)
$$NaCl$$ (Oxidation state of $$Cl=-1$$)
(iv) Valency : Valency of hydrogen is $$1$$ like halogens.
(v) Reaction with metals: hydrogen combine with metals to form binary compounds similar to halogens.
e.g., $$2Na+H_2 \to 2NaH$$
$$2Na+Cl_2 \to 2NaCl$$
(vi) Atomicity Hydrogen exists in diatiomic form $$(H_2)$$ like halogens (e.g., $$Cl_2$$)

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