Trick for Periodic table

Mendeleev's Periodic Table (Importance,Merit and De-merits) || Modern Periodic Table || Mosley's Law || Periodicity || Reason OF Periodicity

Mendeleev's Periodic Table || Modern Periodic Table || Moseley's Law || Periodicity, Cause OF Periodicity

The member of periods and group in the long form of periodic table are

The fourth period of modern periodic table includes: