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Structure of the Atom — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
MCQ
The valence shell of calcium contains ___________?
  • A
    2 electrons
  • B
    4 electrons
  • C
    6 electrons
  • D
    8 electrons
✓

Answer

  1. 2 electrons

Explanation:

The valency shell means the outermost shell or orbit of an element which has valence electrons or outer electrons in it.

The atomic number of calcium is 20 and its electronic configuration is 2, 8, 8, 2 which shows that the outermost orbit or valency shell contains 2 electrons.

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