Answers

2015-05-23T18:43:26+05:30
Valency-Number of protons present in the outermost shell of an atom is known as Valency or The combining power of a element with a atom is also known as Valency.

Taking oxygen as Example-

1.Atomic number of Oxygen is8.
2.Electronic configuration-K=2,L=6.
3.According to the electronic configuration the valency is 6 but it is easy for oxygen to gain 2 protons instead of loosing 6 protons.So, The valency of oxygen is 2.

Taking silicon as example-

1.Atomic number of silicon is 14.
2.Electronic configuration-K=2,L=8,m=4.
3.According to the electronic configuration the valency is +4 or -4 because silicon can either gain 4 electrons or loose 4 electrons because it is a noble gase.
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