1. Intro to Chapter 4 We are finally learning about the atom! Please have out last night’s homework. On the back of your homework divide your paper into two sections. Title the first section “K” and the second “L”. -In the first section labeled “K”, write down everything you think you know about atoms and the periodic table. Homework: Read 4.2 do # 8-10, 12,13

2. Entrance Ticket 9/22/14 Please have out your 4.1 and 4.2 homework 1.) Draw what you think an atom looks like and label it 2.) What was Rutherford’s conclusion from the gold foil experiment?

6. Entrance Ticket 9/23/14 This is the symbol for the isotope of gold that has a mass number of 197 and gold’s atomic number is 79. 1.) How many protons does a gold atom have? 2.) How many electrons does a gold atom have? 3.) How many neutrons does this isotope of gold have?

7. -Write the symbol for the isotope of carbon that has 8 neutrons. (use the periodic table for atomic #)

8. Entrance Ticket 9/24/14 1.) How many protons, neutrons and electrons are in an atom of Copper that has a mass number of 65? 2.) Write the symbol for the isotope of Krypton that has 58 neutrons. Please tear out your isotopes lab (p.12).

9. Answers 1.) Copper-65 has 29 protons, 29 electrons and 36 neutrons. 2.)

10. Isotopes Lab -If these were a real isotopes, all the brown beans would weight the same, but they don’t. This is the same for the white beans and popcorn kernals. -We will find how much each isotope weighs on average and pretend that they all weigh that much.

11. -Grades were updated and posted yesterday you can go look at them. -Please get out your isotopes lab.

12. Lead’s Average Atomic Mass Pb-204 203.973 x 0.014 = 2.9 Pb-206 205.974 x 0.241 = 49.6 Pb-207 206.976 x 0.221 = 45.7 Pb-208 207.977 x 0.524 = 109 + 207.2 207.2

13. Entrance Ticket 9/26/14 1.) What is average atomic mass? 2.) Where is it found? 3.) How is average atomic mass different than the mass number of an isotope? 4.) How is average atomic mass calculated?

14. Answers 1.) Average atomic mass is the weighted average of all the isotopes of an element. 2.) Ave. atomic mass is found on the periodic table. 3.) Mass # is the exact number of protons plus neutrons of an isotope. The ave. atomic mass is an average of the mass #s of all the isotopes of an element. 4.) Ave. atomic mass is calculated by taking the mass of each isotope times its abundance, and then adding those values. 4.) Ave. atomic mass is calculated by taking the mass of each isotope times its abundance, and then adding those values.

15. Entrance Ticket 9/29/14 Pass up entrance ticket #2! 1.) Please describe how you can find the number of protons, neutrons and electrons for a given isotope. 2.) Please write the isotope symbol for sodium- 23. How many protons, neutrons and electrons does it have? Homework: Read 5.1

16. Answers 1)The atomic # tells us the number of protons and electrons. Subtract the atomic # from the mass # to find the amount of neutrons. 2)Sodium-23

17. Entrance Ticket 9/30/14 Please get out last week’s 4.1 & 4.2 homework Please get out last week’s 4.1 & 4.2 homework 1.) Please write the symbol for the isotope Potassium-39. 2.) If electrons are so small that we do not count their mass, why are they important?

18. Entrance Ticket 10/1/14 Please have out yesterday’s handout 1.) What are valence electrons? 2.) Why are valence electrons so important? Honors: Read and outline 5.2

20. Entrance Ticket 10/2/14 (1) Which atom has the electron configuration of: configuration of: 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 2 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 2 (2) Please write the electron configuration for Iron (Fe). configuration for Iron (Fe).

21. Entrance Ticket 10/3/14 1. Which atom has the electron configuration of 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 ? a.) What is the short hand notation for writing this electron configuration? b.) How many valence electrons does this atom have? 2. What is the short cut to find the valence electrons for “s” & “p” block elements?

22. Fireworks Lab -Do not take the beaker with you! -Use a little bit of water and dab the tip of the Q-tip into the salt. Try to use both sides of Q-tip. -Put the tip into the Bunsen burner flame. DO NOT touch the Q-tip to the Bunsen Burner!

23. Entrance Ticket 10/6/14 DO NOT WRITE THIS E.T.! -Please have out your Fireworks Lab -What did the lab have to do with electron configurations? -Why do different metals emit (release) different colors when the are burned?

24. Study Guide Answers Matching 1.J M.C.19. B 2.G11. C20. B 3.A12. D21. C 4.C13. C22. D 5.F14. C23. C 6.E15. D 7.D16. A 8.B17. B 9.H18. A 10. I

25. Study Guide Answers #24.) Take the % abundance of each isotope and change it to a decimal. Multiply the abundance times the mass for each isotope and then add all those values. You should get 65.37 amu

26. Study Guide Answers 25) a) 1s 2 2s 2 2p 6 3s 2 b) 1s 2 2s 2 2p 6 3s 2 3p 3 b) 1s 2 2s 2 2p 6 3s 2 3p 3 c) [Ar] 4s 2 3d 10 4p 5 c) [Ar] 4s 2 3d 10 4p 5 d) [Kr] 5s 2 4d 10 5p 6 d) [Kr] 5s 2 4d 10 5p 6 26) a.) Sulfur 26) a.) Sulfur b.) Neon c.) Scandium

27. Due right now! 1.) Fireworks labs!

28. Due right now! 1.) Fireworks labs! 2.) Electromagnetic wave problems. If your work is on more than one page, please turn it in stapled.