Question

difference between tetra atomic and poly atomic?

Answer 1

here is your answer--Polyatomic ions are charged species that contain two or more than two covalently linked atoms.
Tetra atomic ions are charged species that contain four covalently linked atoms. Tetra atomic ions are a type of polyatomic ions.
Examples of tetra atomic ions are, H3O+( 3 atoms of  H + 1 atom of O), SO32-, NO3-.
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