Question

The first ionisation enthalpies of alkaline earth metals are higher than those of corresponding alkali metals. Explain.

Solution

This is because the atoms of alkaline earth metals have a smaller size as compared to the alkali metals. Therefore, the electrons in the outermost shells of the alkaline earth metals are more tightly held. As a result, the ionisation enthalpies are higher than those of alkali metals.

Some More Questions From The s-Block Elements Chapter

In aqueous solution, Li⁺ ion has lowest mobility. Why?

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason.

For Daily Free Study Material Join wiredfaculty

The S-Block Elements

The first ionisation enthalpies of alkaline earth metals are higher than those of corresponding alkali metals. Explain.

Some More Questions From The s-Block Elements Chapter

In aqueous solution, Li⁺ ion has lowest mobility. Why?

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason.

Which is the most reactive alkali metal and why?

Why alkali metals do not form M²⁺ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?

Why alkali metals are normally kept in kerosene oil?

Why lithium cannot be stored in kerosene?

Why does lithium form complexes?

Why are alkali metal ions diamagnetic and colourless?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Phone Number

Email Address

Location

For Daily Free Study Material Join wiredfaculty

The S-Block Elements

The first ionisation enthalpies of alkaline earth metals are higher than those of corresponding alkali metals. Explain.

Some More Questions From The s-Block Elements Chapter

In aqueous solution, Li+ ion has lowest mobility. Why?

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason.

Which is the most reactive alkali metal and why?

Why alkali metals do not form M2+ ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?

Why alkali metals are normally kept in kerosene oil?

Why lithium cannot be stored in kerosene?

Why does lithium form complexes?

Why are alkali metal ions diamagnetic and colourless?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

In aqueous solution, Li⁺ ion has lowest mobility. Why?

Why alkali metals do not form M²⁺ions?