Question

an atom with 3 protons and 4 neutrons will have a valency of

Answer 1

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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Answer 2

The atom will have a valency of 1.

• An atom has 3 protons and 4 neutrons mean it also contains 3 electrons as the number of protons is equal to the number of electrons.
• Thus the electronic configuration of the atom is as follows-
• ${1s}^{2} {2s}^{1}$
• Thus its 1s orbital has two electrons and 2s orbital has one electron.
• So, the atom has a valency of 1.