Hydrogen forms +1 ions and has one valence electron in an s orbital, which is a reason to put it in column 1 along with the alkali metals (even though it is not a metal). Hydrogen also forms -1 ions and is one electron short of a filled valence, which supports locating it in column 17 with the halogen.
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Grade -10 (SEE) Chemistry
Hydrogen still controversial in modern periodic table
Why is the position of Hydrogen still controversial in modern periodic table?
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