Question

in what respect does hydrogen differ from alkali metals and halogens

Answer 1

Heya friend!
Rajdeep here......

Hydrogen has many properties similar to that of alkali metals and halogens.
However,

As alkali metals,
1. Hydrogen is not a metal.
2. Hydrogen does not originally exist in solid state, whereas all alkali metals are solid.
3. Hydrogen is diatomic, whereas alkali metals are monoatomic.

As halogens,
1. Hydrogen is not so strong a non metal (as mostly it loses electrons).
2. Hydrogen is less reactive than all halogens.

Thanks!!

Answer 2

1)hydrogen is non-metal

alkali metals are metals

2)hydrogen atom has only one shell

alkali have two or more shell