Electronic Configurations and Types of Elements

The correct order of $1^{\mathrm{st}}$ ionisation enthalpy among the following elements $\mathrm{Be}, \mathrm{B}, \mathrm{C}, \mathrm{N}, \mathrm{O}$ is

Arrange the following in proper order of atomic size

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 element with atomic number $117$ if discovered would be placed in _____(halogen family/alkaline earth family).

Element with valence shell electronic configuration as $(\mathrm{n}-1){\mathrm{d}}^5 {\mathrm{ns}}^1$ is placed in which of the following group and block of elements?

Among the elements from atomic number $1$ to $36$, the number of elements which have an unpaired electron in the $\mathrm{s}$-subshell is $6$.

The element with atomic number $117$ if discovered would be placed in halogen family.

Define representative elements?

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

Elements of group$-15$ (nitrogen family) are known as _____(pnictogens/chalcogens)

General electronic configuration of $\mathrm{d}-$block elements is _____.

(A) $(\mathrm{n}-1){\mathrm{d}}^{(1-10)}{\mathrm{ns}}^{(0-2)}$

(B) $(\mathrm{n}-1){\mathrm{d}}^{\left(1\right)}{\mathrm{ns}}^{(0-2)}$

(C) $(\mathrm{n}-1){\mathrm{d}}^{(1-10)}{\mathrm{ns}}^4$

Enter the correct answer as A, B or C.

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

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?

Name the following:

Zero group elements.

Transition elements have _____ penultimate shells.

Representative elements have _____ penultimate shells.

Elements which generally exhibit variable oxidation states and form colored ions are