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3 April, 01:33

What is the period number of hydrogen

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Answers (2)
  1. 3 April, 01:49
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    Hydrogen's period number is 1. It is the first element on the periodic table it has 1 valence electron, it's chemical symbol is H and is group number is 1.
  2. 3 April, 03:41
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    Period number is 1. It's group number also is 1. Hydrogen is a non-metal, yet happens to be on the metal side since it has that many valence electrons.
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