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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
MCQ
Which of the following element has only one valence electron?
  • A
    Oxygen
  • ✓
    Lithium
  • C
    Bromine
  • D
    Argon
✓

Answer

Correct option: B.
Lithium
The element lithium has only one valence electron.
Oxygen, bromine, argon, and arsenic have $2, 7, 8,$ and $15$ valence electrons respectively.

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