Embibe Experts Solutions for Chapter: Making Order Out of Chaos - Early Attempts at the Classification of Elements, Exercise 1: Rajasthan Board-2018

Write the name of the scientist who has given the octave rule for the classification of elements. Explain the octave rule.

Write the name of the scientist who has given a triad law for the classification of elements. Explain the law of triad.

Write any two merits of Mendeleev's periodic table.

Write any two demerits of Mendeleev's periodic table.

Arrange the following elements in the increasing order of electronegativity.

$\mathrm{Be}, \mathrm{F}, \mathrm{O}, \mathrm{N}, \mathrm{Li}$

Explain why the metallic character of elements decreases from left to right in a period.

Arrange the following elements in the decreasing order of their atomic size.

$\mathrm{Na}, \mathrm{Rb}, \mathrm{Cs}, \mathrm{Li}, \mathrm{K}$

Explain, why the size of an anion is bigger than a neutral atom?