Polyatomic ions describes ions which are posses more than one atom. Hence, the formula which represents a polyatomic atomic ion is 
- Sulphates contain both Sulphur and Oxygen atoms, hence, they contain two atoms, thus they are polyatomic.
- Sulphide are represented as
; containing only Sulphur atom, hence, they are mono atomic.
- Chlorides are represented as
; containing only chlorine atoms, hence, they are mono atomic.
- Nitrides are represented as
; containing only Nitrogen atom, hence, they are also mono atomic.
Therefore, sulphates are polyatomic as they contain more than one atom.
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Dam building across naturally flowing rivers tend to decrease discharge of surplus water into sea, reduce nutrient concentration in estuaries and coastal waters, and diminish plankton blooms as well as fish landings.
4 weeks later on a Thursday I’m guessing.
