Why does hydrogen show properties similar to both alkali metals and halogens?

Alkali metals show-

Why does hydrogen show dual nature ?

Elements showing properties of both metals and non-metals

Write two properties of the alkali metal hydrides.

In which of the following properties hydrogen does not show similarity with alkali metals?

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.

Write two properties of alkali metals salts of oxo-acids.

Write two properties of alkali metals salts of oxo-acids.

The similarity in the properties of alkali metals is due to

Write three similarities between hydrogen & alkali metals.