polyatomic

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pol·y·a·tom·ic

 (pŏl′ē-ə-tŏm′ĭk)
adj.
Of or relating to a molecule or ion that has two or more atoms as constituents.

polyatomic

(ˌpɒlɪəˈtɒmɪk)
adj
(Chemistry) (of a molecule) containing more than two atoms
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Adj.1.polyatomic - of or relating to a molecule made up of more than two atoms
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Nitrate is a polyatomic ion with the molecular formula NO3[?
It helps if you know the formula for a polyatomic ion, the common name for the antineuritic vitamin (thiamine), what an exothermic reaction is, and if you can work out complicated chemistry formulas and mathematical equations in your head in seconds.
However, a precipitation method with nitric acid at room temperature to precipitate protein is preferred in our laboratory; this is important to minimize the occurrence of permanent blockage of the nebulizer, the torch, and the sampling orifice resulting from high concentrations of proteins, as well as to reduce polyatomic ion interferences such as [sup.