Embibe Experts Solutions for Chapter: Periodic Classification of Elements, Exercise 1: Exercise

Which of the following elements have properties similar to that of eka boron?

Did Dobereiner's triads also exist in the columns of Newlands' law of octaves? Explain your answer.

The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation of all the three attempts.

What were the limitations of Newlands' law of octaves?

Can the following groups of elements be classified as Dobereiner’s triads?
a) $\mathrm{Na}, \mathrm{Si}, \mathrm{Cl}$    b) $\mathrm{Be}, \mathrm{Mg}, \mathrm{Ca}$
Give reason for your answer
(Atomic masses: $\mathrm{Be} 9; \mathrm{Na} 23; \mathrm{Mg} 24; \mathrm{Si} 28; \mathrm{Cl} 35.5; \mathrm{Ca} 40$)

Describe two anomalies of Mendeleev’s periodic classification of elements.

How could the modern periodic law remove various anomalies of Mendeleev's periodic table? Explain with examples.

Using Mendeleev's periodic table, predict the formula for the oxides of the following elements:

$\mathrm{K}, \mathrm{C}, \mathrm{Al}, \mathrm{Si}, \mathrm{Ba}$.