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A polyatomic ion that contains two hydrogen atoms is called

User Vehomzzz
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A polyatomic ion that contains two hydrogen atoms is called a Dihydrogen
User IRoygbiv
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A polyatomic ion that contains two hydrogen atoms is called a dihydrogen.
It is a rule for non-metallic polyatomic molecules to make use of such prefixes before each element's name.
User Jonas Brandel
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