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.

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?

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

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

Transition elements are coloured

Ce-58 is the member of?

The sizes of following species increase in the order:

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 $117$ if discovered would be placed in

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