Hydrogen exhibits the properties similar to both alkali metals and halogens.
In what respect does hydrogen differ from :
(i) alkali metals (ii) halogens ?
Question 2
Why does H+ ion always get associated with other atom or molecules?
(a) Ionisation enthalpy of hydrogen resembles that of alkali metals.
(b) Its reactivity is similar to halogens
(c) It resembles both alkali metals and halogens
(d) Loss of an electron from hydrogen atom results in a nucleus of very small size as compare to other or ions. Due to small size it cannot exist free.
Give two properties in which hydrogen neither resembles with alkali metals nor with halogens.
why is hydrogen placed in the 1st group though it has the properties of both halogens and alkali metals?