Q2 of 10 Page 46

Give a scientific reason for the following

In the atmosphere, Oxygen is available as O2 but not as O.

Oxygen has electronic configuration 2, 6. The outer most shell of oxygen has 6 electrons so its valency is 2. It wants to accept two electrons to complete its octet to get stability. So it combines with another oxygen atom to complete its octet. In O2 molecule, both O atoms have a complete octet. So O2 is more stable than O atom. Hence Oxygen is available as O2 in the atmosphere.


More from this chapter

All 10 →
1

Some elements can have different valences. It can happen due to the change in

 2

Give a scientific reason for the following

The Valency of noble gases is zero.

 3

Answer the following

Define:


a) Atomic mass


b) Relative atomic mass


c) Gram molecular mass


d) Mole.


e) Valency of an element

 3

Calculate the percentage composition of carbon and Oxygen in CO2. (given atomic masses : Carbon =12 and oxygen =16)