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Question

Hydrogen differs from elements of VII-A group as:
  1. it can gain one electron
  2. it has one electron in its valence shell
  3. its electronic configuration is different from other elements
  4. both B and C

A
it can gain one electron
B
its electronic configuration is different from other elements
C
both B and C
D
it has one electron in its valence shell
Solution
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Hydrogen differs from elements of VIIA group as:

(A) Hydrogen can either share or gain or lose one electron whereas the elements of VIIA group can gain one electron.

(B) Hydrogen has one electron in its valence shell whereas elements of VIIA group have 7 valence electrons.

(C) The electronic configuration of hydrogen is different from the elements of VIIA group.

So, options B and C are the correct answers.

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