Which physical property is lower for alkaline earth metals as compared to alkali metals of the same period ?

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Hardness

Melting point

Electropositivity

Ionisation potential

answer is C.

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Detailed Solution

Alkali metal (IA)	Alkaine earth metals (IIA)
Hardness	IA	< IIA
Melting Poin	IA	< IIA
Electro positivity	IA	> IIA

Ionization Potential : IA < IIA
→ Alkaline earth metals are harder when compared to alkali metals
Reason :
1 Due to their small
2 Due to involvement of two valency electrons in metallic bond formation the inter atomic attraction strong. Therefore in order to break up those attraction force high amount of heat [Energy] required i.e., they possess high melting points
→ As size decreases, their valency electrons are strongly held by the nucleus inorder to remove those electrons high energy is required, i.e., high I.E is required