Polyatomic Ion - a group of covalently bonded atoms that have an overall electric charge. They act like a single ion when combining with other atoms to form compounds.
The Lewis structure above shows a group of 5 atoms sharing electrons (covalently bonded) to reach 8 valence electrons. There are a total of 32 valence electrons in the diagram.
- An oxygen atom is known to have 6 valence electrons - 4 X 6 = 24
- A phosphorus atom is known to have 5 valence electrons - 1 X 5 = 5
- That's a total of 29 electrons!
- The group of atoms has 3 EXTRA electrons!
See a chart of the polyatomic ions used in this class.