Question

An atom with 3 protons and 4 neutrons have a valency of ___.

Answer 1

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

The valency of an element is the measure of its combining power with other atoms when it forms chemical compounds or molecules.

Atomic number = Number of protons = 3.

Mass number = Number of protons + number of neutrons =3 + 4 = 7.

The electronic configuration of the atom is 2,1(K, L)

Now valency of atom = 8 - mass number of that atom.

Valency of atom = 8 - 7 = 1.

Hence, its valency is 1.