Merits and Demerits of Modern Periodic Table

The position of an element in the modern periodic table can be predicted from its 

"The modern periodic table correlates the position of the element with its electronic configuration more clearly", justify the statement with an example.

Which of the following is not a demerit according to the modern periodic table?

Which of the following is a demerit according to the modern periodic table?

Justify the reason for the position of helium in the modern periodic table.

One of demerit of the modern periodic table is the position of lanthanide and actinides has not been given inside the main body of the periodic table.

Give any two drawbacks of the modern periodic table?

The 15 elements have been placed in VI period and third group of the periodic table. They are called

All the lanthanoids and actinoids belong to group _____ of the periodic table.($3/4$).

The first member of lanthanoid series is lanthanum.

All the lanthanoids and actinoids belong to group _____ of the periodic table.($3/4$)

The fifteen elements from Lanthanum to Lutetium are named as _____

All the lanthanoids and actinoids belong to group _____ of the periodic table. (Write the group number)

All the lanthanoids and actinoids belong to group _____ (write group number)of the periodic table.

The total number of rare-earth elements are:

The 15 elements have been placed in VI period and third group of the periodic table. They are called

Elements in which $4\mathrm{f}$ orbitals are progressively filled are called as:

The total number of rare-earth elements is :

$\mathrm{C}\mathrm{e}\mathrm{ }\left(58\right)$ is a member of

The 1$4$ elements have been placed in $\mathrm{V}\mathrm{I}\mathrm{t}\mathrm{h}$ period and third group of the periodic table. They are called