Question

Give two examples of elements which exists as;

(a) solid (b) liquid ( c) gas, under normal conditions.

Answer 1

Elements that exist under normal conditions are:

1. Solid - Iron ($\mathrm{Fe}$) and copper ($\mathrm{Cu}$) exist as solid as they have close packing of atoms having the least inter-particle space.
2. Liquid - Bromine ($\mathrm{Br}$) and mercury ($\mathrm{Hg}$) exist as liquid as they moderate inter-particle spaces and loose packing of atoms.
3. Gas - Fluorine ($\mathrm{F}$) and oxygen ($\mathrm{O}$) exist as gases as they have a random arrangement of atoms having the highest inter-particle space.