Question

| What are inert elements? write the element and atomic
number of the element of third period and 18th column of periodic table​

Answer 1

inert elements are those elements that have an octet or duplet configuration .

Argon is the element of third period in the 18th group and it's atomic number is 18

Answer 2

Answer:

the elements that don't react with other elements are known as inert elements.They can make their presence in reaction only in specific conditions.

These elements are Noble gases which are present in 18 the group of periodic table. These have valanced shells having an octet(8 electrons) or duplet(2 electrons) in their outermost shell.

no of elements in 3rd period=8

no of elements in 18th group=7

and the point where 3rd period and 18th group meets at argon