2. In atom A how many electrons are there? Ion D? Ion E? 1. In atom A how many protons are there? Ion D? Ion E? 2. In atom A how many electrons are there? Ion D? Ion E? 3. How are the 3 diagrams the same? 4. How are they different? 5. One diagram is listed as an atom; the other two are listed as ions. What makes an ion different from an atom? 6. How does the atomic mass change when an atom becomes an ion?
Building on the Atom: Ions
Ion – an atom that has gained or lost electrons Cation - positive charge - Ion that has lost an electron (e-) Anion - negative charge - Ion that has gained an electron (e-) # protons does not = # electrons
Ion – an atom that has gained or lost electrons
Atomic Symbol vs. Ion Symbol Oxygen vs. Oxygen (-2) O O-2 Sodium vs. Sodium (+1) Na Na+ Zinc vs. Zinc (2+) Zn Zn2+
Complete Small Stuff in the Small World Worksheet Examples: Atomic # Atomic Mass p+ n0 e- Phosphorous (-3) 15 30.974 16 18 Barium (+2) 56 137.33 81 54 Complete Small Stuff in the Small World Worksheet