Why alkaline earth metals are harder than alkali metals?

थोडक्यात उत्तर

The strength of metallic bonds in alkaline earth metals is higher than alkali metals due to the presence of 2 electrons in its outermost shell as compared to alkali metals, which have only 1 electron in the valence shell. Therefore, alkaline earth metals are harder than alkali metals.
The alkaline earth metals have greater nuclear charge and more valence electrons, thus metallic bonding is more effective. Due to this, they are harder than alkali metals.

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पाठ 5: Alkali and Alkaline Earth Metals - Evaluation [पृष्ठ १५५]

पाठ 5 Alkali and Alkaline Earth Metals
Evaluation | Q II. 14. | पृष्ठ १५५

Discuss the general characteristics and gradation in properties of alkaline earth metals.

Which one of the alkaline earth metal carbonates is thermally the most stable?

The product obtained as a result of a reaction of nitrogen with CaC₂ is ______.

Assertion: Generally alkali and alkaline earth metals form superoxides.

Reason: There is a single bond between O and O in superoxides.

Assertion: BeSO₄ is soluble in water while BaSO₄ is not

Reason: Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.

When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to ______.

Name an element from Group 2 which forms an amphoteric oxide and a water soluble sulphate.

Why are BeSO4 and MgSO₄ readily soluble in water while CaSO₄, SrSO₄ and BaSO₄ are insoluble?

Assertion (A): Beryllium carbonate is kept in the atmosphere of carbon dioxide.

Reason (R): Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide.

Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is ______.