2. Question of the Day Rules You must work alone You may use your textbook today You have 8 minutes to complete the QOD Good luck!!

3. Questions of the Day Use Thomson’s cathode ray experiment to answer the following questions? 1)What conclusion did Thomson draw from each of the following observations? a)The cathode rays cause a small propeller inside the tube to turn. b)The rays are identical regardless of the metal used to make the cathode. c)The cathode rays are attracted to the positive pole of an electrical field.

4. Cathode Ray Experiment

5. Answers a) The cathode rays cause a small propeller inside the tube to turn. The rays are made up of particles of matter.

6. Answers b) The rays are identical regardless of the metal used to make the cathode. The rays are common to all elements.

7. Answers c) The cathode rays are attracted to the positive pole of an electrical field. The cathode rays are negatively charged.

8. What are we doing Today? Questions of the day Notes FL 1-3 & FL 1-4 Electron Configuration Get back Quiz First 20 elements of table & electron configuration quiz next class

9. Atom Structure Textbook Chapter 1 (Pages 10-17) The atom is the basic building block of matter. It is the smallest unit of a chemical matter and it is composed of three elementary particles: electrons, neutrons and protons.

10. Subatomic Particles

11. Atom

12. Atomic Number Atomic Number (Z): number of protons in the nucleus of each atom of a given element – In a neutral atom: Atomic number will also indicate the number of electrons

13. Atomic Weight Atomic Weight represents the mass of an atom. It is the weight in grams of one mole (mol) of the mass of a given element It is expressed in terms of g/mol

14. Questions? How many protons does Carbon have? Answer = 6

15. Questions 2) How many electrons does Carbon have? 3) Have many neutrons does Carbon have? Answer = 6 12 – 6 = 6 Answer = 6

16. How many protons, electrons and neutrons does nitrogen have? How many protons, electrons and neutrons does oxygen have? How many protons, electrons and neutrons does silicon have? How many protons, electrons and neutrons does phosphorous have? How many protons, electrons and neutrons does sulfur have?

17. How many protons, electrons and neutrons does nitrogen have? P=7 E=7 N=7 How many protons, electrons and neutrons does oxygen have? P=8 E=8 N=8

18. Questions 2) How many protons, electrons, neutrons does Silicon have? 3) Have many protons, electrons, neutrons does Phosphorous have? Protons = 14 Electrons = 14 Neutrons = 14 Protons = 15 Electrons = 15 Neutrons = 31-15 = 16

19. Questions 2) How many protons, electrons, neutrons does Sulfur have? Protons = 16 Electrons = 16 Neutrons = 32-16=16

20. QUIZ Quiz next class on electron configuration and naming first 20 elements. Page 3-4 of the workbook