How many electrons are there in the L-shell of Boron?

What happens to the non-metallic nature as we move from left to right in groups?

The Lanthanoid series is the same as the Actinoid series.

The physical and chemical properties of an element are the periodic function of its _____

What’s the name of the 109th element as per the nomenclature?

ns1 and ns2 are the outer shell configurations of elements in s-block.

In Mendeleev’s periodic classification, what is the number of groups?

For the 115th element _____ is the name as per IUPAC nomenclature and ______ is the official name.