Question

7. Define valency by taking examples of silicon and oxygen.


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Answer 1

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Valency: Valency is defined as the number of hydrogen atoms which combine directly or indirectly with one atom of an element.

Example: One atom of nitrogen combines with three atoms of hydrogen to form ammonia gas.

The valency of Silicon is 4 as these electrons can be shared with others to complete octet. Thus,the valency of oxygen is 2 as it will gain 2 electrons to complete its octet

Answer 2

• Answer:
• The combining capacity of an atom is known as its valency. The number of bonds that an atom can form as part of a compound is expressed by the valency of the element

Valency of silicon

Atomic number of silicon is 14.

The electronic configuration of the element is – K=2, L=8,m=4.

According to the electronic configuration the valency is +4 or -4 because silicon can either gain 4 electrons or lose 4 electrons because it is a noble gas.

Hence, valency of silicon is 4.

Valency of oxygen

Atomic number of Oxygen is8.

Electronic configuration – K=2, L=6.

According to the electronic configuration the valency is 6, but it is easy for oxygen to gain 2 electrons instead of loosing 6 electrons.

Hence, the valency of oxygen is 2.