Hydrogen is usually placed in Group 1 of the periodic table, with the alkali metals, but it is a special case that also shares similarities with the halogens (Group 17).

What family is hydrogen in?

  • In most modern periodic tables, hydrogen appears at the top of Group 1, above lithium, because it has one electron in its outer shell, like the alkali metals.
  • Chemically, however, hydrogen is a nonmetal , not a metal, and its behavior is quite different from typical alkali metals.
  • Hydrogen can also resemble the halogens (Group 17) because it is one electron short of a filled shell and forms diatomic molecules (H₂, like Cl₂ or F₂).

How chemists often describe it

  • Textbooks often say: hydrogen is in Group 1 but is a “special” or “anomalous” element that does not fully belong to any single family.
  • Some alternative versions of the periodic table even place hydrogen above fluorine in the halogen column, to emphasize its halogen‑like side.

One-sentence recap

Hydrogen is officially placed in Group 1 with the alkali metals, but it is a unique nonmetal that also shows halogen-like behavior, so many chemists treat it as its own special family.

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