An atom with 3 protons and 4 neutrons will have a valency of
  1. 3
  2. 7
  3. 1
  4. 4

AcademicChemistryNCERTClass 9

Correct Answer: (c) 1 

Explanation: The mass number of atoms is the total number of protons + the total number of neutrons.

Hence mass number = 3 + 4 = 7.

Valency of atom = 8 - mass number of that atom.

Valency of atom = 8 - 7 = 1.

Hence, the valency of the atom is 1.

raja
Updated on 10-Oct-2022 13:32:10

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