no3
The polyatomic ion in KNO3 (potassium nitrate) is NO3- , the nitrate ion. This ion is polyatomic because it contains four atoms bonded together. The nitrate ion is derived from nitric acid, HNO3.
Polyatomic ion in the compound Na2O2 is known as peroxide. Such polyatomic ion contains two or more atoms covalently bonded.
Na2Cr2O7 is an ionic compound with a polyatomic ion. The polyatomic ion present in this compound is the chromate ion (Cr2O7)^2-.
SO4
HCO3- is the polyatomic ion with which sodium bonds. It is the bicarbonate ion.
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.
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.
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).
The polyatomic ion is the ammonium ion, NH4^+
The sulfate ion (SO42-) is the polyatomic ion
If the compound contains a polyatomic ion, simply name the ion.
KOH is an ionic compound with a polyatomic ion. The hydroxide ion (OH-) is a polyatomic ion that is composed of one oxygen atom and one hydrogen atom.