With the increase in atomic weights,melting points of the alkali metals

The highest melting point among alkali metal of-

The low melting point of alkali metals is due to

Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture: A)In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group B)The reactivity decreases in the alkali metals but increases in the halogens with increases in atomic number down the group. C)In both the alkali metals and the halogen the chemical reactivity decreases with increases in atomic number down the group D)Chemical reactivity increases with increases in atomic number down the group in both the alkali metals and halogens.

The order of melting point of chloirdes of alkali metals is :

The decrease in melting and boiling points of alkali metals with rise in atomic number is due to

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