dissimilarities between hydrogen and halogen
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Size of Atom: The size of the H- ion is much larger than those of the ions of Halogens. This is because hydrogen has only one electron and proton and the pull of the nucleus is less. Reaction with Water: Also unlike halogens, the hydrogen ion H- is unstable in water.
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Hydrogen has only one shell while halogens have more than shell.
Hydrogen can loose or gain electron to complete it's octet while halogens only can gain electron to complete it's octet.
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