Bellwork : Monday 2/13/2012

1. Bellwork: Monday 2/13/2012 • Atom • The atom is mostly empty space; & the nucleus is positively charged • Niels Bohr • John Dalton • The smallest particle of an element (with the same properties as the element), is called a(n) ___. • What two major discoveries did Rutherford make? • Whose atomic model involves electron shells? • Who developed the Billiard Ball model? • (Multiple Choice) Because atoms are so small, a. scientists create models to describe them. b. they cannot be made of smaller particles. c. there is no way to describe them. d. they cannot be synthesized by scientists.

2. Periodic Table- Page 8 • Element- a pure substance consisting of one type of atom; unique atomic number; cannot be chemically broken down into other substances • Element name- the name of a chemical element • Chemical symbol- (aka atomic symbol) an abbreviation of the element name • Natural elements: 1-2 letters • Some man-made : 3 letters (temporary)

3. Pass Out blue periodic tablewhat words can you spell??

4. Extra Credit? • http://www.privatehand.com/flash/elements.html • Play Tom Lehrer's "The Elements"  song or show thisFlash animation of the song by Mike Stanfill.  • If you can sing this song…in front of the class…then I will give you extra credit! The Boy Who Lived (Harry Potter) did it and so can you! • Harry Potter Video

5. Periodic Table Scavenger Hunt- pg 6 • Periodic Table Scavenger Hunt. To complete use: • Blue Periodic Table Handout • Textbook pages 91-103

6. Nature of Science CRT REVIEW TIME Get out your pink packets so we can go over answers

7. CRT Review – Pg. 1 L • Control – factor in an experiment that is kept the same • Dependent variable – factor whose value is the result you are testing • Graduated cylinder – glass container with markings, used to measure volume of liquids • Gram – SI unit of measurement for mass • Hypothesis – an idea that can be tested by experiment or observation • Independent variable – factor that affects the value of the dependent variable • Liter – unit of liquid volume used with the SI (metric) system • Meter – base unit for length in the SI (metric) system • Pie chart – a graph in the shape of a circle, where the size of each slice indicates a percent of the whole • Risk-benefit analysis – identifying the possible negative (risk) and positive (benefit) results of a technology, before deciding to use it • Scientific ethics – study of the impact of technology and science on human society • Scientific inquiry – efforts to understand and explain the natural world through observation and experiment • Scientific model – simplified version of some part of the natural world that helps explain how it functions • Trade off – accepting the drawbacks of a technology because of its benefits • Trial – one set of measurements or observations in an experiment

8. CRT Review – Pg. 2 • 7) B • 8) D • 9) B • 10) B • 11) A • 12) D • 1) C • 2) B • 3) D • 4) A • 5) C • 6) A

9. CRT Review – Pg. 3 • 6) B • 7) C • 8) B • 9) B • 10) B • 1) C • 2) A • 3) C • 4) A • 5) D

10. Bellwork: Wednesday 2/15/12 • Hints: • # of protons = # of electrons • # of protons = Atomic number • Protons + Neutrons = Atomic Mass Find the # of protons, neutrons, electrons, atomic mass, or atomic number when given certain information. • 6 protons • # electrons? • Atomic number? • Element? • 34 electrons • # protons? • Atomic number? • Element? • 29 protons & 35 neutrons • Atomic mass? • Element? • 6 protons • 6 electrons • Atomic number: 6 • Carbon • 34 electrons • 34 protons • Atomic number: 34 • Selenium • 29 protons & 35 neutrons • Atomic mass: 64 amu • Copper

11. Evolution of the Periodic Table- It’s Elementary- Video 6.34 pg. 8 MAJOR IDEA: • The properties of the elements repeat in each period (row) of the table • An element’s properties can be predicted from its location in the periodic table!

12. Organizing the Elements: Arrangement of the Periodic Table • Mendeleev: discovered that patterns appeared when the elements were arranged in order of increasingatomic mass. • Sometimes this method didn’t work, so he would put the elements in a “best fit” location. • SONG

13. Organization of the Modern Periodic Table PASS OUT BIG white Periodic Table! Label these on your blue and white PT! Periods- horizontal rows (1-7)

14. Groups- vertical columns (1-18) Label these on your blue and white PT!

15. Bellwork: Thursday 2/16/2012 • DimitriMendeleev - 1869 • By increasing atomic number. • Atomic number 35: a. 35 protons b. 35 electrons c. Bromine, Br d. 45 neutrons • Who organized the periodic table by increasing atomic mass? • How is the modern periodic table arranged? • Answer the following questions about the element with atomic number 35: • # protons? • # electrons? • Atomic Name and symbol? • # neutrons?

16. Pg. 7 Answers – 32 points, 1 pt. per line

17. The Element Quiz • You will take a quiz on all the elements and compounds you have to memorize from page 7 • Elements • Name, Symbol, and Atomic # • MUST be spelled right and use correct capitalization for symbol • Compounds • Common name, symbol, and scientific name • Spelling counts! • Must have the numbers be smaller than the letters. • You MUST get 100% on this test. You will have a zero in the gradebook until you get 100%. • I will give you 3 chances in class to achieve 100%. Once you get it, you don’t have to take it anymore. You will keep taking it until you do. If you can’t get it in 3 chances, you will have to find time before or after school until you get 100 • Quiz will be completely fill in the blank so you better know your stuff!

18. Modern Periodic Table • Organized based on atomic number(discovered in the 1900’s) rather than atomic mass • British scientist, Henry Mosley, created the modern periodic table of elements • At 27 years old he was killed in WWI What are examples of some elements that don’t fit Mendeleev’s original model (organized by increasing atomic mass)? Cobalt/Nickel- 27/28 Tellurium/Iodine- 52/53 Argon/Potassium- 18/19 Thorium/Protactinium- 90/92 Uranium/Neptunium- 92/93 Plutonium/Americium- 94/95

19. Trends in the Periodic Table: Physical Properties of Elements • When elements are arranged in order of increasing atomic number, their physical and chemical properties show a periodic pattern.

20. How do elements get their names? • Find at least 3 element names on the periodic table that have names that are odd or recognizable. Where do you think the name came from? • Named after places discovered/created • Germanium- Germany • Berkelium- Berkeley, California • Americium – named after the country America, where the element was created (in Chicago, Illinois) • Europium – named after the continent Europe • Named after famous scientists • Rutherfordium- Ernest Rutherford • Einsteinium- Albert Einstein • Named using words from other languages • Copper (Cu) – “cuprum,” derived from Greek; named after the island in Cyprus in which it was mined • Gold (Au) – “aurum,” derived from Latin; called the solar metal; associated with the Sun (Sol) • Iron (Fe) – “ferrous,” derived from Latin; associated with the celestial body, Mars

21. Groups in the Periodic Table

22. Reminders Atomic Number Atomic Mass Sum of the number of protons and neutrons in the nucleus of an atom • Number of protons in the nucleus of an atom • Atoms are neutral • # protons = # electrons • Elements are arranged in Periodic Table according to increasing atomic number