Science
Class 9
1263
Knowledge
We know that the valency is the combining capacity of an atom.
and
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