Question

Explain why hydrogen and halogens have valency same

Answer 1

Answer:

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

−

→H

−

(hydride ion)

Cl+e

−

→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

→2NaH

2Na+Cl

2

→2NaCl

(vi) Atomicity Hydrogen exists in diatiomic form (H

2

) like halogens (e.g., Cl

2

)

Explanation:

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