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Hydrogen can form both cations (H+) and anions (H-) because of its unique position in the periodic table.
As the first element, hydrogen has only one electron and one proton. When it loses its electron, it becomes a positively charged ion (H+). When it gains an electron, it becomes a negatively charged ion (H-).
The ability of hydrogen to form both cations and anions is due to its small size and low electronegativity. Its small size allows it to easily lose or gain an electron, and its low electronegativity means that it is not strongly attracted to electrons.
The formation of H- ions is relatively rare, but it can occur in certain chemical environments, such as in the presence of strong reducing agents.