Question

Hydrogen occupies a unique position in reactivity series.Explain.

Answer 1

The position of hydrogen is unique in Modern Periodic table. This is because:

(i) The valence shell configuration of hydrogen and alkali metals is same, contain one electron.  That is the reason, some of the properties of hydrogen are similar to those of alkali metals and it must be placed group 1.

(ii) Both hydrogen and halogens require one electron to complete their valence configuration therefore they show similarities in their properties and hydrogen can be placed in group 17.

(iii)Hydrogen also exhibits some unique properties like oxides of hydrogen (water ) is neutral in nature whereas meals form basic oxides and halogens form acidic oxides.

Answer 2

The position of hydrogen is unique in Modern Periodic table. This is because:

(i) The valence shell configuration of hydrogen and alkali metals is same, contain one electron. That is the reason, some of the properties of hydrogen are similar to those of alkali metals and it must be placed group 1.

(ii) Both hydrogen and halogens require one electron to complete their valence configuration therefore they show similarities in their properties and hydrogen can be placed in group 17.

(iii)Hydrogen also exhibits some unique properties like oxides of hydrogen (water ) is neutral in nature whereas meals form basic oxides and halogens form acidic oxides.