Embibe Experts Solutions for Chapter: Classification of Elements and Periodicity in Properties, Exercise 4: EXERCISE-4

The order of screening effect of electrons of $\mathrm{s}, \mathrm{p}$, $\mathrm{d},$and $\mathrm{f}$ orbitals of a given shell of an atom on its outer shell electrons is:

The statement that is not correct for periodic classification of elements is:

Among halogens, the correct order of amount energy released in electron gain (electron gain enthalpy) is

which of the following statements are correct ?

Among the elements $\mathrm{B}, \mathrm{Al}, \mathrm{C}$ and $\mathrm{Si}$.

(i) Which element has the highest first ionisation enthalpy?

(ii) Which element has the most metallic character?

Justify your answer in each case.

The radius of ${\mathrm{Na}}^{+}$ cation is less than that of Na atom. Give reason.

Discuss and compare the trend in ionisation enthalpy of the elements of group $1$ with those of group $17$ elements.
 

 Amongst the following elements whose electronic configurations are given below, the one having the highest ionisation enthalpy is