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

$\mathrm{X}, \mathrm{Y} \mathrm{and} \mathrm{Z}$ are three members of a Dobereiner's triad If the atomic mass of $\mathrm{X}$is $7$ and that of $\mathrm{Z}$is $39$. What is the atomic mass of $\mathrm{Y}$?.

There are some vacant places in Mendeleev’s periodic table. In some of these places, the atomic masses are seen to be predicted. Enlist three of these predicted atomic masses along with their group and period.

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

In Mendeleev's periodic table, why was there no mention of noble gases like helium, neon, and argon?

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.

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:

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

An element X (atomic number $17$) reacts with an element Y(atomic number $20$) to form a divalent halide.
What is the position of elements X and Y in the periodic table?