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Ch 3 Exam Review Objective iWBAT Participate in a Ch 3 exam review activity. Drill Switch to the half life drill ppt This scientist developed the Atomic Theory of Matter Ans: John Dalton Ions An atom that loses an electron is called a(n) ___________. Ans: cation Who Developed this model of the atom? Who Developed this model of the atom? Ans: J.J. Thomson This type of radiation can be stopped by paper or clothing Alpha Which Scientist… Used the Oil Drop experiment to determine the mass of an electron Robert Millikan What are the three characteristics that allow you to distinguish between the three types of radiation? Charge, mass, and penetrating power Which Scientist… Called the negatively charged particles electrons JJ Thomson Rutherford used this experiment to determine that an atom contains a nucleus Gold Foil Experiment (or Alpha Scattering experiment) A sodium atom has a charge of what? zero Beta particles consist of a stream of high speed: electrons Which scientist used this experiment? Which scientist used this experiment? Ans: Rutherford Who developed the four postulates of atomic theory, including atoms are the smallest, indivisible part of an element? Ans: John Dalton How many protons does the ion Na+1 11 If an element has 9 protons and 10 electrons does it have a positive or negative charge? negative What are the three types of radioactive particles/rays? Alpha, beta, and gamma Who Developed this model of the atom? Who Developed this model of the atom? Ans: Erwin Schrodinger Who developed the Plum Pudding model? Ans: J.J. Thomson Which Scientist… Named the core of the atom “the nucleus” Rutherford How many electrons does Na+1 have? 10 When writing the chemical symbol for an ion, where is the charge written in relation to the chemical symbol? In the upper right hand corner How many protons does Ca+2 have? 20 Ions An atom that gains electrons is called a(n) ___________. Ans: anion What subatomic particle has a charge of 0? A neutron Which subatomic particle has a charge of +1 A proton This type of radiation is not a particle gamma Who used the oil-drop experiment and what did it prove? Ans: Robert Millikan-the charge to mass ratio of the electron What did the Gold-foil experiment show? Ans: That the nucleus of the atom is very small and positively charged. Which scientist used this experiment? Which scientist used this experiment? Ans: Millikan What did the cathode ray tube experiment prove? Ans: Electrons are negatively charged Who Developed this model of the atom? Who Developed this model of the atom? Ans: Niels Bohr Who performed the gold-foil alpha scattering experiment? Ans: Ernest Rutherford Who used cathode ray tubes to study electrons? Ans: J.J. Thomson You determine the charge of an ion by subtracting the number of electrons from: The number of protons A neutron changing into a proton and an electron describes which type of radioactive decay? beta If iron (Fe) undergoes alpha decay, what element is formed? Cr (chromium) If nickel (Ni) undergoes beta decay, which element is formed? Cu (copper) What is the symbol for an alpha particle? See next slide for answer What is the symbol for an alpha particle? How many protons does F-1? 9 This type of radioactive particle has a mass of 4 AMU, consisting of 2 protons and 2 neutrons Alpha particle Isotopes contain different numbers of: ______ Neutrons All elements with atomic numbers greater than what are radioactive? 83 What is the symbol for a beta particle? See next slide for answer What is the symbol for a beta particle? What does the 37 stand for in chlorine - 37? The mass number Given the chemical symbol Kr, how many neutrons are present? 84 - 36= 48 What is the approximate mass of an electron in AMU? zero How many neutrons does Al (aluminum) have? 27-13 = 14 Which Scientist Developed the Quantum Mechanical model of the atom? Ans: Schrodinger As atomic number increases, the number of neutrons and protons : (increases or decreases) increases Which subatomic particle is responsible for the increased mass of an isotope? neutron Which Scientist Experimented using Cathode Ray Tubes? Ans: Thomson This type of radiation can only be stopped by concrete or lead gamma What is the specialty term that we give to the atomic mass when we round it? The mass number Which Scientist Is the Greek philosopher who believed that there are small indivisible bodies from which everything else is composed. Ans: Democritis Nuclei are unstable if they contain too many or too few: Neutrons Elements with atomic numbers between 1 and 20 have almost equal numbers of protons and what? neutrons Radioactive elements are found in this area of the periodic table? The bottom section This is the spontaneous emission of radiation from an atom Radioactivity Name the 3 subatomic particles of an atom. Proton, neutron, electron What does the AMU stand for? Atomic Mass Unit Measured the charge of an electron using the oil drop experiment. Millikan If an element has 19 protons and 18 electrons, what is its charge? +1 Which subatomic particle has no charge? Neutron Final Jeopardy This scientist wrote the 4 postulates of the atomic theory of matter Dalton Which isotope is the entire periodic table based on? Carbon-12