Question : Define valency by taking examples of silicon and oxygen.
Subject

Science

Standard

Class 9

Views

1263

Asked By

Knowledge

Alexandria
Answer / Solution

We know that the valency is the combining capacity of an atom.

  • Atomic number of oxygen = 8 and
  • Atomic number of silicon = 14 K L M

and

  • Electronic configuration of oxygen = 2 6 –
  • Electronic configuration of silicon =2 8 4

In the atoms of oxygen the valence electrons are 6 (i.e., electrons in the outermost shell). To fill the orbit, 2 electrons are required. In the atom of silicon, the valence electrons are 4. To fill this orbit 4 electrons are required.

Hence,

The combining capacity of oxygen is 2 and of silicon is 4. i.e.,

Valency of oxygen = 2 and Valency of a Silicon = 4


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