1. Chlorine is considered what type of matter? A)Homogeneous mixture B)Compound C)Element D)Heterogeneous mixture E)Solution

2. A mixture of unknown liquids are distilled. There plateaus are found to be at 45 degrees C and 96 degrees C. What do we know for sure about the liquids? A)Only 1 liquid of flammable B)Both liquids are flammable C)One liquid is water D)One liquid has boiling point of 45C E)They are the same liquid

3. Atomic Structure 1.Parts of an atom 2.Periodic table & atoms 3.Scientific Atomic Models 4.Isotopes

4. Parts of an atom Charge (+, -, 0) LocationMassSymbol Proton Neutron Electron

5. Parts of an atom Protons & Neutrons = NUCLEUS

6. Parts of an atom Quarks 6 types Up & Down most common  stable 3 quarks = 1 proton or 1 neutron He

7. Parts of an atom Charge (+, -, 0) LocationMassSymbol Proton Neutron Electron

8. Periodic table & atoms Atomic Number = number of protons A# Carbon = Atomic Mass/Weight = number of protons + neutrons Atomic Mass Carbon = How do you determine # of neutrons? How can you determine # of electrons? (hint: e- have opposite charge of p+)

9. Periodic Table & Atoms Writing Chemical Formulas Subscript = # of atoms in compound Parentheses = distribute to those inside C 6 H 12 O 6 Cu(NO 3 ) 2

10. Magnesium has an atomic number of 12 and a mass number of 24. How many protons does Magnesium have? A)12 B)24 C)36 D)0 E)6

11. Silicon has an atomic number of 14 and a mass number of 28. How many electrons does Silicon have? A)14 B)28 C)42 D)0 E)7

12. Fluorine has an atomic number of 9 and a mass number of 19. How many neutrons does Fluorine have? A)9 B)19 C)28 D)10 E)5

13. How many atoms are in the following compound - Na 2 (OH) 2 A)2 sodiums, 1 oxygen, 1 hydrogen B)2 sodiums, 2 oxygens, 2 hydrogens C)2 sodiums, 1 oxygen, 2 hydrogens D)1 sodium, 2 oxygens, 2 hydrogens E)1 sodium, 2 oxygens, 1 hydrogen

14. Beryllium has an atomic number of 4 and a mass number of 9. How many electrons does Beryllium have? A)4 B)9 C)13 D)5 E)7

15. Argon has an atomic number of 18 and a mass number of 40. How many protons does Argon have? A)40 B)22 C)18 D)12 E)9

16. Which subatomic particle is found outside the nucleus? A)Proton B)Neutron C)Electron D)Quarks

17. Scientific Atomic Models 1.Bohr Model Electrons are held in energy levels Energy levels can hold specific amounts of e- 1 = 2 e- 2 = 8 e- 3 = 18 e-

18. Scientific Atomic Models 1.Bohr Model Electrons can gain and lose energy When gain  electron jumps to higher level When lose  electron gives off light 1 = 2 e- 2 = 8 e- 3 = 18 e-

19. Drawing Bohr Models Lithium - 7 Sulfur - 32 Nitrogen - 14

20. Scientific Atomic Models 2.Electron Cloud Model Electrons are not in FIXED orbits Location of e- determined by probability Nucleus Higher probability of finding an e-

21. Scientific Atomic Models 2.Electron Cloud Model High probability spots = ATOMIC orbital Each orbital can hold 2 e- Multiple orbital per energy level Nucleus Higher probability of finding an e-

22. Scientific Atomic Models 2.Electron Cloud Model Each orbital can hold 2 e- Multiple orbital per energy level Energy Level 1Energy Level 2 How many electrons? How many orbitals?

23. Isotopes Elements with the SAME number protons & electrons but have a DIFFERENT number of neutrons Atomic weight/mass – weighted average of all isotopes on Earth Nitrogen - 14Nitrogen - 15