S K Malhotra Solutions for Chapter: Periodic Classification of Elements, Exercise 1: Test Your Knowledge

On the basis of the periodic classification, identify each set belonging to either a group or a period.

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

On the basis of the periodic classification, identify each set belonging to either a group or a period.

$\mathrm{B}, \mathrm{C}, \mathrm{N}$

On the basis of the periodic classification, identify the given set belonging to either a group or a period.

$\mathrm{He}, \mathrm{Ne}, \mathrm{Ar}$

The formula of magnesium oxide is $\text{MgO}$. The formula of magnesium chloride can be written as ${\mathrm{Mg}}_{\mathrm{x}}{\mathrm{Cl}}_{\mathrm{y}}$

The value of x and y in the formula can be-

A. x = 1, y = 1

B. x = 1, y = 2

C. x = 2, y = 1

"Enter your correct answer as A, B or C."

The electronic configuration of an element is $2, 8, 7$. What is its expected valency? (Note: give the answer in word)

Two elements A and B belong to the same period. What is common in them? (Electron shells / Number of valence electrons)

Explain the variation in the following property of the elements in the periodic table.

Metallic character in a period.

Explain the variation in the following property of the elements in the periodic table.

Valency in a group.