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

4. Ion – an atom that has gained or lost electrons

5. Atomic Symbol vs. Ion Symbol
Oxygen vs. Oxygen (-2) O
O-2
Sodium vs. Sodium (+1) Na
Na+
Zinc vs. Zinc (2+) Zn
Zn2+

6. 15 30.974 16 18 56 137.33 81 54 Phosphorous (-3) Barium (+2) Atomic #
Examples:
Atomic #
Atomic Mass p+ n0 e-
Phosphorous (-3) 15
30.974 16 18
Barium (+2) 56
137.33 81 54
Complete the Ion Table + put it in your notebook

7. same element different masses
Isotope - Variation of a type of atom
All isotopes of an atom have the same # protons
Each isotope of an atom has different mass
Therefore,
Each isotope has a different mass #
Each isotope has a different # neutrons
same element different masses

8. Isotope Hydrogen-1 Hydrogen-2 Hydrogen-3 Atomic Number 1 Mass Number 3
# protons
# neutrons
# electrons
Nuclear Symbol

9. Examples: Atomic # Mass #p #n #e Nitrogen-12 Nitrogen-14 Sulfur-30

10. Complete "An Investigation into Isotopes"
Examples:
Atomic #
Mass #p #n #e
Nitrogen-12 7 12 5
Nitrogen-14 14
Sulfur-30 16 30
Sulfur-32 32
Complete "An Investigation into Isotopes"