What are the similarities between Hydrogen and Halogens

Following are the similarities between hydrogen and halogens:
(a) In both cases, one electron is required to complete its valence shell.
(b) Hydrogen, as well as halogen, are non-metals.
(c) When they are combined with metals, they act as negative ions.
(d) Their molecules are diatomic.
(e) Hydrogen and halogens both can form an ionic and covalent bond.

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