1. January, 2012

2. Regular Atoms  Atomic Number  = the number of protons  = the number of electrons  Atomic Mass  = the number of protons + neutrons  Gold  P: 79  N: 197-79 = 118  E: 79

3. Your Turn: Regular Atoms 1. Vanadium 2. Ruthenium 3. Iodine 4. Sulfur 5. Silicon 6. Oxygen 7. Radon 8. Cerium 1. P: 23 N: 28 E: 23 2. P: 44 N: 57 E: 44 3. P: 53 N: 74 E: 53 4. P: 16 N: 16 E: 16 5. P: 14 N: 14 E: 14 6. P: 8 N: 8 E: 8 7. P: 86 N: 136 E: 86 8. P: 58 N: 82 E: 58

4. Isotopes  Atoms of the SAME ELEMENT that have a different number of NEUTRONS (New Mass) Gold - 200  Atomic Number  = Number of Protons  = Number of Electrons  Atomic Mass  = the number of Protons + Neutrons  =200 now! (See Above?)  Gold – 200  P: 79  N: 200 – 79 = 121  E: 79

5. Your Turn: Isotopes! 1. P: 6 N: 8 E: 6 2. P: 19 N: 18 E: 19 3. P: 76 N: 124 E: 76 4. P: 50 N: 65 E: 50 5. P: 29 N: 36 E: 29 6. P: 54 N: 80 E: 54 7. P: 22 N: 28 E: 22 8. P: 40 N: 60 E: 40 1. Carbon-14 2. Potassium-37 3. Osmium-200 4. Tin-115 5. Copper-65 6. Xenon-134 7. Titanium-50 8. Zirconium-100

6. Ions  Atoms of the same element where the ELECTRONS are not equal to the PROTONS  Charged Atoms  Losing Electrons Creates a Positive Ion  Gaining Electrons Creates a Negative Ion  Atomic Number  = the Number of Pr0tons  Atomic Mass  = the Number of Protons + Neutrons  Gold 3+  P: 79  N: 118  E: 79 – 3 = 76

7. Your Turn: Ions 1. P: 13 N: 14 E: 10 2. P: 5 N: 6 E: 9 3. P: 18 N: 22 E: 19 4. P: 34 N: 45 E: 32 5. P: 26 N: 30 E: 25 6. P: 88 N: 138 E: 93 7. P: 80 N: 121 E: 78 8. P: 10 N: 10 E: 12 1. Aluminum 3+ 2. Boron 4- 3. Argon 1- 4. Selenium 2+ 5. Iron 1+ 6. Radium 5- 7. Mercury 2+ 8. Neon 2-