what is meant by tetra atomic and poly atomic?

Tetra-atomic may refer to either molecules or ions. Tetra-atomic molecules or ions are those species which are formed when 4 atoms chemically combine together, that is they contain 4 atoms. For example, NH3, SO3 are examples of tetra-atomic molecules, CO32- is a tetra-atomic ion. 

For polyatomic molecule, please refer to the following link

https://www.meritnation.com/ask-answer/question/what-do-you-mean-by-polyatomic/atoms-and-molecules/3068243

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tetra atomic molecules are those molecules which are formed by when 4 atoms chemically bond together

polyatomic molecules are those molecules which are formed when 8 or more atoms combine together

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molecules which are formed when 4 atoms chemically bond together is called tetrapolyatomic molecules atomic molecules.

molecules which are formed when 8 or more atoms combine together is called

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