Question

Define valency by taking examples of

aluminium and oxygen​

Answer 1

Answer:

In chemistry, the valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules.

For eg. Aluminium (Al) has the valency of 3.

This is because it has 3 Valence electrons in its last shell.

Hence Al has the capacity to lose 3 electrons to get noble gas electronic configuration.

For eg. Oxygen(O) has valency of 2

This is because it has 6 Valence electrons.

Hence, O has the capacity to gain 2 electrons to get noble gas electronic configuration.

I hope this helps

Explanation:

Answer 2

Answer:

Valency: It reflects the number of electrons an atom has to gain or lose to achieve the octet. If we consider the electronic configuration of

Aluminum: 1S² 2S² 2P⁶ 3S² 3P¹

Oxygen: 1S² 2S² 2P⁴

Here the number of electrons in the outermost shell is 3, So it has to lose 3 electrons to achieve the octet. Therefore it's valency is 3.

Similarly, in the case of Oxygen, it has to gain 2 electrons to achieve the octet. Therefore it's valency is 2

Explanation: