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9.1 Atomic Theory1. Matter is composed of tiny, indivisible particles called atoms. 2. An element is composed of one type of atom. Properties of atoms are identical to each other. 3. A compound contains two or more different elements. The relative number of atoms of each element in a compound is the same. 4. Atoms don’t change their identities in chemical reactions.-just rearranged. http://www.youtube.com/watch?v=ZnKqiojoFJU Three subatomic particles make up an atom; Type Proton Neutron Electron Charge Mass +1 1.673 x 10-24amu No 1.65 x charge 10-24amu location Nucleus -1 Electron Cloud 9.109 x 10-28amu Nucleus Strong nuclear force- holds nucleus together even though protons try to repel. Atomic number- number of protons in the nucleus. Gives elements their identity. Same as #of electrons Mass number or Atomic mass- number of protons plus neutrons. (isotope= same number of protons, different number of neutrons) Nucleus- positively charged • Relative mass- 10,000 • Diameter= 10-15 meters 100,000 times smaller than the electron cloud. Relative size = 1 Electron cloud- negatively charged • Relative mass- 1 • Diameter- 10-10 –(100,000 larger than the nucleus) Relative size = 100,000 Periodic table- Page 225 Periods- horizontal row Group- vertical column Metals- shiny, opaque, good conductor of heat and electricity, malleable Nonmetals- poor conductors, brittle, dull Metalloids- properties of both http://www.pbs.org/wgbh/nova/physics/cern.h tml 1.Assignment READ 9.1 and then do Do a/b questions page 223. Do page 237, Solving Problems 1-6 2.Assignment- read 9.2Do #s 1-4 page 228 do #s 7-10-Solving Problems p.237