Embibe Experts Solutions for Chapter: Classification of Elements and Periodicity in Properties, Exercise 1: Exercise 1

First $\mathrm{IE}$ of $5\mathrm{d}$ series elements are higher than those of $3\mathrm{d}$ and $4\mathrm{d}$ series elements. This is due to:

Which one of the following is the smallest?

Size of isoelectronic species ${\mathrm{F}}^{-}, \mathrm{Ne}$ and ${\mathrm{Na}}^{+}$ is affected by

The atomic radii of $\mathrm{F} \text{and} \mathrm{Ne}$ in Angstrom are, respectively, given by:

For electron affinity of halogens which of the following is correct?

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

lanthanoids and actinoids resemble in :

Alumina is