Electronic Configurations and Types of Elements

The electronic configuration of an element is $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^3$.  What is the atomic number $\left(\mathrm{X}\right)$ of the element which is just below the above given element in the periodic table. Enter the value of $\mathrm{X}$.

Which of the following cations posses neither noble gas configuration nor pseudo inert gas configuration?

$\left(\mathrm{i}\right){\mathrm{Bi}}^{3+}$              $\left(\mathrm{ii}\right) {\mathrm{Pb}}^{2+}$           $\left(\mathrm{iii}\right) {\mathrm{Sn}}^{2+}$          $\left(\mathrm{iv}\right) {\mathrm{Tl}}^{+}$

What will be the IUPAC name of element with atomic number $103$.

What is the element with atomic number 83?

Select the incorrect statement about the element ${}_{33}\mathrm{As}$ according to Modern periodic table.

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?

Define representative elements?

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?

Complete the given table

Complete the given 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?

Which of the following species will have the largest and the smallest size? $\mathrm{K},{\mathrm{K}}^{+},\mathrm{Ca},{\mathrm{Ca}}^{2+},$ Explain?

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 ?