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Structure of the Atom — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
MCQ
Elements with valency 1 are:
  • A
    Always metals.
  • B
    Always metalloids.
  • C
    Either metals or non-metals.
  • D
    Always non-metals.
✓

Answer

  1. Either metals or non-metals.

Explanation:

Metals and non-metals both can have valency 1.

Metals which have 1 valence electron and non-metals which have 7 valence electrons, have valency 1. It is because, metals loose their 1e“ and non-metals gain 1e“ to complete their octet.

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