The total number of elements in the $10^{th}$ period of the periodic table will be:

Which of the following statements is incorrect?

What will be the position in the periodic table for an element with the electronic configuration $ns^2 np^4$ where $n = 3$?

Match the elements in List-$I$ with their symbols in List-$II$.

List-$I$	List-$II$
$(1)$ $Unnilbium$	$(A)$ $Db$
$(2)$ $Unnilennium$	$(B)$ $Lr$
$(3)$ $Unnilpentium$	$(C)$ $Mt$
$(4)$ $Unniltrium$	$(D)$ $Bh$
	$(E)$ $No$
	$(F)$ $Rg$

What is the main basis for the arrangement of elements in the modern periodic table? Describe it.

The elements with atomic numbers $Z=117$ and $Z=120$ have not yet been discovered. In which family or group would you place these elements,and what would be their expected electronic configuration?