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Chapter 5 Review Atomic Theory/Scientists Who was the first person to theorize the existence of the atom in 400 BC? Democritus Atomic Theory/Scientists Who was given credit as the first person that proved the nature of atoms? John Dalton Atomic Theory/Scientists According to Dalton’s Atomic Theory, all elements are composed of tiny indivisible particles called_______? atoms Atomic Theory/Scientists Dalton’s Atomic Theory stated that atoms of the same _______ are identical. element Atomic Theory/Scientists Dalton’s Atomic Theory was for the most part correct, except for the fact that atoms can be ________. divided Atomic Theory/Scientists Who is credited with discovering the electron? JJ Thomson Atomic Theory/Scientists Experiments with cathode ray tubes led to the discovery of the ________. electron Atomic Theory/Scientists The rays produced in the early cathode ray tube experiments were attracted to a _________ charge. positive Atomic Theory/Scientists JJ Thomson discovered that electrons have a very_____ mass. small Atomic Theory/Scientists Who discovered the proton? E. Goldstein Atomic Theory/Scientists Who discovered the neutron? Chadwick Atomic Theory/Scientists What happened to most of the particles in Rutherford’s gold foil experiment? most passed through the foil Atomic Theory/Scientists In Rutherford’s experiment, a few of the positive particles bounced back, so what did he concluded they bounced off of? a dense positive region called the nucleus Atomic Theory/Scientists Who discovered the nucleus? Rutherford Atomic Theory/Scientists Which experiment did we re-create in lab using wooden boards and marbles? Rutherford’s gold foil experiment Subatomic Particles Which subatomic particle has a negative charge? electron Subatomic Particles Which subatomic particle has a positive charge? proton Subatomic Particles Which subatomic particle is neutral? neutron Atoms Atoms are electrically neutral because the number of _________ equals the number of ___________. protons equal electrons Atoms What is the charge of the nucleus of an atom? positive (because the protons are positive) Atoms What determines the identity of an element? the number of protons Atoms Isotopes of the same element differ in what two ways? mass number and number of neutrons Atoms What 3 things do isotopes of the same element have in common? atomic number, number of protons and electrons Atoms How do you find the number of protons for an atom? same as the atomic number Atoms How do you find the number of neutrons for an atom? mass # - atomic # Atoms How do you find the number of electrons for an atom? same as the atomic number Atoms All atoms of the same element have the same ________ ________. atomic number Atoms What element is the standard for determining atomic mass units? Carbon - 12 Atoms The average atomic mass depends on the masses of the isotopes and the relative __________ of each isotope. abundance Atoms What unit is used to measure relative atomic mass? amu’s Atoms The atomic mass listed on the periodic table is a _______ atomic mass. average Atoms Sodium has atomic number 11. If a sodium atom has a mass of 23, how many protons does it have? 11 (same as atomic number) Atoms Sodium has atomic number 11. If a sodium atom has a mass of 23, how many neutrons does it have? 12 (subtract mass#-atomic#) Atoms Sodium has atomic number 11. If a sodium atom has a mass of 23, how many electrons does it have? 11 same as atomic number Atoms A carbon atom has 6 protons, 6 electrons and 8 neutrons. What is it’s mass number? 14 (protons + neutrons) Atoms A carbon atom has 6 protons, 6 electrons and 8 neutrons. What is it’s atomic number? 6 (same as protons) Atoms Hg-200 has an atomic number of 80. How many neutrons does it have? 120 Atoms Hg-200 has an atomic number of 80. How many protons does it have? 80 Atoms Hg-200 has an atomic number of 80. How many electrons does it have? 80 Study!!! Visit my website tonight to see this power point!