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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
MCQ
An atom with $3$ protons and $4$ neutrons will have a valency of:
  • A
    $3$
  • B
    $7$
  • C
    $1$
  • ✓
    $4$
✓

Answer

Correct option: D.
$4$

Atomic number = Number of protons $= 3$
Mass number = Number of protons $+$ number of neutrons $=3 + 4 = 7$
Electronic configuration of the atom is $2, 1(K,L)$
Hence, its valency is $1.$

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