January, 2012

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

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: P: 44 N: 57 E: P: 53 N: 74 E: P: 16 N: 16 E: P: 14 N: 14 E: P: 8 N: 8 E: 8 7. P: 86 N: 136 E: P: 58 N: 82 E: 58

Isotopes  Atoms of the SAME ELEMENT that have a different number of NEUTRONS (New Mass) Gold  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

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

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

Your Turn: Ions 1. P: 13 N: 14 E: P: 5 N: 6 E: 9 3. P: 18 N: 22 E: P: 34 N: 45 E: P: 26 N: 30 E: P: 88 N: 138 E: P: 80 N: 121 E: P: 10 N: 10 E: Aluminum Boron Argon Selenium Iron Radium Mercury Neon 2-