Define valency by taking example of silicon and oxygen.{atomic number of silicon=14 and atomic number of oxygen=8}

the gain or lose of electron to in an atom is called valancy.

the valancy of silicon is 2 , 8 , 4

the valancy of oxygen is 2, 6

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Valency is the number of electrons gained, losse, shared by an element for stable. It depends on valence electrons.

Valency of silicon = 4

Valency of oxygen = 2

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combining capacity of an atom is known as valency.

valency of silicon = 4  silicon shares 4 electrons

valency of oxygen = 2  Oxygen gains 2 electrons

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The valency of an element is the combining capacity of that element. The valency of an element is determined by the number of valence electrons present in the atom of that element.

If the number of valence electrons of the atom of an element is less than or equal to four, then the valency of that element is equal to the number of valence electrons. For example, the atom of silicon has four valence electrons. Thus, the valency of silicon is four.

On the other hand, if the number of valence electrons of the atom of an element is greater than four, then the valency of that element is obtained by subtracting the number of valence electrons from eight. For example, the atom of oxygen has six valence electrons. Thus, the valency of oxygen is (8 − 6) i.e., two.

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the valency 
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Bich hole u
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