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