It is said that hydrogen shows properties similar to that of halogens as well alkali metals, then why it can't be consider as a metalloid?

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Solution

Hydrogen has only one electron due to which it shows properties similar to alkali metals with only one valence electron and halogens which are short of only one electron. Hydrogen can loose the only electron like alkali metals or gain an electron like halogens. But metalloids have no resemblance with the electronic configuration of metals or non-metals. Their properties are in between those of metals and non-metals. Hence, hydrogen is not a metalloid but an element with some properties similar to alkali metals and some properties similar to halogens.

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Similar questions

Q. Hydrogen exhibits the properties similar to both alkali metals and halogens.

Q. Hydrogen is placed in group - I as it shows similarities in properties with alkali metals (Li, Na, K, etc.). Identify such similar properties between Hydrogen (H) and Alkali metals (M).

Q. The position of hydrogen is not fixed in the periodic table, sometimes it is placed with alkali metals in 1st group and sometimes with halogens in the

17^{t h}

group as it resembles with alkali metal metals as well as with 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

(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.

Q. Assertion :Hydrogen resembles both, alkali metals as well as halogens. Reason: Hydrogen forms oxides, halides and sulphides, and exists as diatomic molecule.

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