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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
MCQ
What is the valency of potassium with atomic number $19\ ?$
  • A
    $0$
  • ✓
    $1$
  • C
    $2$
  • D
    $3$
✓

Answer

Correct option: B.
$1$
The electronic configuration of potassium is $\{2, 8, 8, 1\}.$
The valence shell contains $1$ electron therefore the valency of potassium is $1.$

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