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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
MCQ
Which of the following atom has a valency of three:
  • A
    Magnesium
  • B
    Fluorine
  • ✓
    Aluminium
  • D
    Carbon
✓

Answer

Correct option: C.
Aluminium

Aluminium with three valence electrons has a valency $= 3$
Fluorine has seven valence electrons and has a valency $= 1$
Magnesium has two valence electrons and has a valency $= 2$
Carbon has four valence electrons and has a valency $= 4$

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