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Answer.

The hydrogen gas, which is just liberated as a result of a chemical is called nascent hydrogen or newly born hydrogen. It is obtained by passing dihydrogen gas at atmospheric pressure through an electric arc between two tungsten rods. The properties of hydrogen that resemble alkali metal are:-

(a) Electronic configuration; Hydrogen atom has one electron in its valence shell like alkali metals.

(b) Valency; Hydrogen generally shows + 1 valency like alkali metals.

(c) Metallic character; It readily loses its electron to form a positive ion like other alkali metals.

(d) Combination with non-metals; Hydrogen, like the alkali metals, combines readily with non-metals like halogens, oxygen, sulphur, etc.

(e) Reducing agent; Hydrogen is a good reducing agent like other alkali metals.

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