METALLIC CHARACTER, MELTING POINT, MULTIPLE BONDING

METALLIC CHARACTER & BOILING POINT

MELTING & BOILING POINT & DENSITY & METALLIC CHARACTER

MELTING POINT, ENTHALPY OF FUSION, METALLIC CHARACTER

Assertion (A): Alkali metals are soft and have low Melting and boiling points. Reason (R): This is because interatomic bonds are weak.

Assertion (A): Transition metals have low melting points. Reason (R): The involvement of greater number of (n-1)d and ns electrons in the interatomic metallic bonding.

Low melting point metals are purified by:

Assertion: The melting and boiling points of the alkali metals are low. Reason: Alkali metals have weak metalli bonding.

Compare alkaline earth metals with alkali metals w.r.t (a) atomic and ionic size, (b) metallic bonds, ( c) melting points and (d) hardness.