Inert gas elements Normal elements

Inert gas elements	Normal elements
i. In the atoms of Inert gas elements all the shells are completely filled including the outermost shell. ii. These elements are placed in zero group (group 18) of modern periodic table. iii. These elements have stable electronic configuration and hence, they are chemically inactive. iv. Their valency is zero.	i. In the atoms of Normal elements only the outermost shell is incompletely filled. ii. These elements are placed in groups 1 and 2 on the left side and 13 to 17 on the right side of modern periodic table. iii. These elements do not have stable electronic configuration and hence, they are chemically active. iv. They normally show one type of valency.