Electronic Configurations and Types of Elements

What is the valency of sodium?

Arrange the following in proper order of atomic size

The atomic number of element $\mathrm{Unq}$ is

Which of the elements, whose atomic number are given below, cannot be accommodated in the present set up of the long form of the periodic table?

The atomic number of element $\mathrm{Unq}$ is

Which of the elements, whose atomic number are given below, cannot be accommodated in the present set up of the long form of the periodic table?

An element has its electronic configuration as 2, 8, 2. To which period does this element belong?

In Lanthanoid series, the element well known to exhibit $+4$ oxidation state is

To which group and period does the element belong if the electronic configuration of an element in its $-2$ oxidation state is $1 {\mathrm{s}}^{2}2 {\mathrm{s}}^{2}2{\mathrm{p}}^{6}3 {\mathrm{s}}^{2}3{\mathrm{p}}^6?$

Which among the following is a metalloid?

Among the elements from atomic number $1$ to $36$, the number of elements which have an unpaired electron in the s-subshell is

Which of the following pairs contain metalloid elements in the periodic table ?

The element with atomic number $113$ has recently been discovered. Its electronic configuration is similar to that of

What would be the IUPAC name for the element with the atomic number $120$?

Which of the following pairs contain metalloid elements in the periodic table?

An element, which is recently discovered is placed in $7^{\text{th }}$ period and ${10}^{\text{th }}$ group. $\mathrm{IUPAC}$ name of the element will be:

Which of the following electronic configurations in the outermost shell is characteristic of alkali metals?

Which of the following set of atomic numbers represents representative element?

Which of the following is the best general electronic configuration of normal element?

The element, with atomic number $118$ , will be