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SEMESTER 2 EXTRA CREDIT PROJECT: ATOMIC TIMELINE DUE DATE: April 21, 2017 **NOTE** **THIS IS A 50 POINT PROJECT…IT IS AN EXTRA CREDIT ASSIGNMENT** Your task is to complete a BOOKLET or POWERPOINT SLIDE SHOW or TIMELINE to represent the changes in Atomic Theory that have occurred over the past 300 years. WHAT TO DO: Write the year on the top of each page in your booklet or slide presentation (there will be 6 PAGES). Use textbook pages 125 – 128 to find the date for each discovery in the table on the other side of this paper **NOT EVERYTHING WILL BE IN THE BOOK. YOU MAY HAVE TO FIND SOME INFORMATION FROM OTHER SOURCES** The theories are listed on the other side of this paper. Determine the year each theory is associated with. (REMEMBER THAT THERE MAY BE SEVERAL THEORIES FOR EACH YEAR LISTED). On each year’s page, write or print all theories for that time frame. On each year’s page, draw a picture of what the scientists believed an atom looked like at the time. On each year’s page, write the name of the scientist associated with that theory. EXAMPLE: EARLY 1800’S Believed that atoms were smooth and solid, like a billiard ball SCIENTIST: JOHN DALTON Decorate the cover and put your name, date and period on the back of your book SCORING CRITERIA: PAGE COMPONENTS -Theories on correct pages -Creativity (Neatness & Effort) -Cover page -Image of what atom was believed to look like -Correct scientist for each theory -Date POINTS 20 6 6 6 6 6 DATES FOR EACH PAGE: (one per page) Early 1800’s 1897 1911 1913 1920s 1932 SCIENTISTS (one per page): BOHR DALTON THOMSON CHADWICK RUTHERFORD VARIOUS SCIENTISTS THEORIES: (there may be several on one page) There are small, negatively charged particles inside an atom Most of an atom’s mass is in the tiny, positively charged nucleus An atom’s positive charge must be clustered in a tiny region in its center The energy of each electron keeps it in motion around the nucleus Atoms must contain some sort of positive charge Atoms are mostly empty space Electrons of different energy levels are likely to be found in different places Electrons move only in certain orbits Atoms cannot be created or destroyed Electrons can be anywhere in a cloudlike region around the nucleus At the center of the atom is a tiny, massive nucleus containing protons and neutrons. Elements combine in specific proportions to form compounds A particle with no charge, called a neutron, was discovered Atomic model resembled layers of an onion, or planets circling the sun Cloud model Modern Atomic Theory All elements are made of atoms that cannot be divided The structure of an atom was like a blueberry muffin Atoms of the same element are exactly alike The gold foil experiment was conducted