The valency of atoms can be zero when:

Outer most orbit achieves octet

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Outer most orbit gets completely filled

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Outer most orbit has same number of electrons as the valence electrons of noble gases.

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All of these.

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Solution

The correct option is D
All of these.

Valency is combing capacity of an atom. When the atom has completely filled outermost orbit (as in case of noble gases), it is stable by itself and doesn't react. So combining capacity that is, valency is zero.

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Similar questions

If an atom of an element has 34 electrons in total, then what is the outer most orbit of the atom and the number of valence electrons?

The electrons in the outer most orbit of X, Y and Z atom are 7, 2 and 3 respectively. The valencies of the atoms are:

Statement 1: Hydrogen atom just needs 1 extra electron to fill its outer-most orbit.

Statement 2: The first orbit can occupy only 2 electrons.

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