2. What are POLYATOMIC IONS? What is a group of atoms with charge? back to naming compounds Lets first review what a monatomic ion is
3. In a single atom ( monatomic ), charge results from having either more electrons or less electrons than protons. + + + + + Less electrons than protons = positive charge ( cations ) More electrons than protons = negative charge ( anions ) + + + + +
4. Example: The magnesium ion has two less electrons than protons 2+ Mg
5. Example: The magnesium ion has two less electrons than protons 2+ back to polyatomic ions Mg