Question

haydrogen shows similarity with alkali metals as well halogens​

Answer 1

Answer:

hydrogen shows similaritiy with halogens and alkali metals because the molecular formula of hydrogen is H2 while the molecular formulae of fluorine and chlorine are F2 and Cl2 ,respectively .

In the same way, there is a similarity in the chemical properties of hydrogen and alkali metals. There is a similarity in the molecular formulae of the compounds of hydrogen and alkali metals (Na,K,etc) formed with chlorine and oxygen.

Answer 2

Answer:

(1) Hydrogen shows similarity with alkali metals :

(i) Hydrogen has electronic configuration 1s¹ which is similar to outer electronic configuration of alkali metals, ns¹.

(ii) Both, hydrogen and Alkali metals form univalent positive ions (+1) by loss of 1 electron

(iii) Both combine with halogen to form halides.

$\sf{H_2 + Cl_2 → 2HCl}$

$\sf{2Na + Cl_2 → 2NaCl.}$

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(2) Hydrogen show similarity with halogens :

(i) Halogens have outer electronic configuration $\sf{ns^2np^5}$ which resembles that of hydrogen 1s¹.

(ii) Both form univalent negative ion (-1).

(iii) Both react with metals.

$\sf{2Na_{(s)} + H_2{(g)}→2NaH_{(s)}}$

$\sf{2Na + Cl_2 →2NaCl}$