Quiz 1: Atomic Structure – Flashcards
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Select all that apply. John Dalton believed which of the following about atoms? a. atoms are real even though they're invisible b. all atoms of a single substance are identical c. the atom could be divided into smaller parts d. atoms of different substances differ by weight
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a. atoms are real even though they're invisible. b. all atoms of a single substance are identical. d. atoms of different substances differ by weight.
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Lavoisier made an important contribution to chemistry by ____. a. being the first to use the term "atom" b. describing the orbits of electrons c. discovering the proton d. identifying substances by weight
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d. identifying substances by weight.
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Henri Becquerel and the Curies found out that ____. a. atoms were not indivisible and indestructible b. the atom had a nucleus c. there was a lot of empty space in the atom d. atoms were very small
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a. atoms were not indivisible and indestructible.
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The neutron was discovered by ____. a. Becquerel b. Thomson c. Rutherford d. Chadwick
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d. Chadwick.
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Cathode rays were shown to be a stream of ____. a. protons b. electrons c. neutrons d. quarks
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b. electrons.
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What is the best image to show how Thomson envisioned the atom.
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A complete positive charge with little negative charges inside.
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What experimental evidence was provided for the nuclear model of the atom? a. line spectra of hydrogen b. cathode rays bending toward strong magnets c. alpha particles bouncing off of gold foil d. none of the above
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c. alpha particles bouncing off of gold foil.
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The Bohr model of the atom addressed he problem off ____. a. why electrons didn't fall into the positive nucleus b. how so many positive charges could be crowded into such a small space in the nucleus c. how so much energy could be released from an atom d. all of the above
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a. why electrons didn't fall into the positive nucleus.
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True or false. Energy in the atom can be absorbed or released only in quanta of energy.
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True.
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Each orbit surrounding an atom is allowed ____. a. only 2 electrons b. only 8 electrons c. an unlimited number of electrons d. a limited number of electrons
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d. a limited number of electrons.
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Which particles make up the nucleus of an atom? a. protons and electrons b. electrons and neutrons c. neutrons and protons d. protons, neutrons, and electrons.
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c. neutrons and protons.
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What is the charge of an atom? a. positive b. negative c. neutral
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c. neutral.
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Where is the most of the mass of an atom located? a. in the nucleus b. in the orbits c. in the electrons d. it is a split between the nucleus and the orbits
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a. in the nucleus.
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The maximum number of orbits in an atom is ___. a. three b. five c. seven d. nine
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c. seven.
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True or false. The lowest possible energy position for an electron is known as the ground state.
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True.
