Presentation on theme: "2. In atom A how many electrons are there? Ion D? Ion E?"— Presentation transcript:
1 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?
2 Building on the Atom: Ions Thursday, September 17th, 2015
3 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
5 Atomic Symbol vs. Ion Symbol Oxygen vs. Oxygen (-2)OO-2Sodium vs. Sodium (+1)NaNa+Zinc vs. Zinc (2+)ZnZn2+
6 15 30.974 16 18 56 137.33 81 54 Phosphorous (-3) Barium (+2) Atomic # Examples:Atomic #Atomic Massp+n0e-Phosphorous (-3)1530.9741618Barium (+2)56137.338154Complete the Ion Table + put it in your notebook
7 same element different masses Isotope - Variation of a type of atomAll isotopes of an atom have the same # protonsEach isotope of an atom has different massTherefore,Each isotope has a different mass #Each isotope has a different # neutronssame element different masses
8 Isotope Hydrogen-1 Hydrogen-2 Hydrogen-3 Atomic Number 1 Mass Number 3 # protons# neutrons# electronsNuclear Symbol