It means many diffrent compounds.
Polyatomic ion in the compound Na2O2 is known as peroxide. Such polyatomic ion contains two or more atoms covalently bonded.
That compound is called rubidium phosphate.
Polyatomic ions are named with their specific names, regardless of their overall charge. When naming an ionic compound with a polyatomic ion, the name of the cation is written first followed by the name of the anion (polyatomic ion).
Na2Cr2O7 is an ionic compound with a polyatomic ion. The polyatomic ion present in this compound is the chromate ion (Cr2O7)^2-.
An example of a compound composed of a metal and a polyatomic ion is magnesium sulfate (MgSO4). In this compound, magnesium is the metal, and the sulfate ion (SO4) is the polyatomic ion.
SO4
CaSO4 is a polyatomic ionic compound. It consists of a metal cation (Ca2+) and a polyatomic anion (SO42-) that are attracted to each other through ionic bonds.
One example of a compound that includes a polyatomic ion containing oxygen is sodium nitrate (NaNO3). This compound contains the nitrate ion (NO3-) which is a polyatomic ion that includes oxygen.
Calcium hydroxide, Ca(OH)₂, is not considered a polyatomic compound itself, but it contains a polyatomic ion, hydroxide (OH⁻). In this compound, two hydroxide ions are bonded to a calcium ion (Ca²⁺). Therefore, while Ca(OH)₂ is an ionic compound, it includes a polyatomic ion within its structure.
HCO3- is the polyatomic ion with which sodium bonds. It is the bicarbonate ion.
no3
NO3 -