Question

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As per recent trend hydrogen is placed at the top of the periodic table and not in the group 1, why?

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Answer 1

AnsWer :

1) Hydrogen has atomic number 1 and electronic configuration 1s¹.

2) It resembles alkali metals having the electronic configuration ns¹, with respect to the formation of unipositive ions and formation of oxides, halides and sulphides.

3) Alkali metals have low ionisation enthalpy, thus, in terms of ionization enthalpy, hydrogen (which has a very high ionisation enthalpy) resembles more with halogens.

4) Hydrogen is gaseous while all other elements of group 1 are solids.

5) Also, hydrogen does not possess metallic character under normal conditions unlike the alkali metals which exhibit metallic character.

6) Hydrogen also resembles halogens.

eg. It forms anion $\rm H^{-}$ like halides, diatomic molecule $\rm H_2$, covalent compounds, etc.

7) Hydrogen is very less reactive as compared to halogens.

8) Thus, hydrogen resembles both the alkali metals and the halogens, though in case of certain properties, it also differs from them.

9) This unique behaviour of hydrogen makes its position in the periodic table controversial or anomalous.

10) Therefore, hydrogen is best placed separately at the top of the periodic table.

Answer 2

Answer:

Hydrogen is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkali metals. ... Hydrogen also forms H2 dihydrogen like halogens.

Explanation:

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