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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
  • D
    4
✓

Answer

  1. 1

Explanation:

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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