Give two reason , why the number of elements in first period is only 2 ?

why the number of elements in the first period is only 2 ?

Give two reasons, why the number of elements in the first period is only 2 ?

The number of elements in the first period is only 2. Give reason.

What are the number of elements under the first short period?

What are the number of elements under first very long period?

Give reasons why ? The oxidizing nature of elements increases on moving from left to right along a period in the periodic table.

First ionisation energy of elements increases with atomic numbers of the elements in a period-why cite an exception.

Give the number of elements in 2^(nd)and5^(th) period in Modern Periodic Table.

Give a reason why period-2 elements are called bridge elements