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In which group should hydrogen be placed? In group 1 or group 17? Why?

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1 Answers

  • Hydrogen contains one valence electron in its valence shell and thus, its valency is one. Therefore, hydrogen resembles alkali metals (group 1 elements) as they also contain one electron in their valence shell (alkali metals tend to lose their valence electron).
  • However, hydrogen also shows similarity with halogens (group 17 elements) as their valency is also one because halogens tend to accept one electron in their valence shell.
  • Due to this unique behaviour, it is difficult to assign any definite position to hydrogen in the modem periodic table. 

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