Question

Give reasons for the following questions.
a) ‘f’ block elements are kept separately in the periodic table.
b) Atomic size decreases across the period.
c) In the first period hydrogen and helium are not placed adjacent to each other.

Answer 1

Answer:

F block elements are called inner transition element.

Explanation:

They are kept separately in periodic table because of there different properties and there are maximum 14 electrons that can be occupied by f orbital