Atomic Theory 2 Question Preview (ID: 60553)
Review Of Rutherford's Gold Foil Experiment.
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Which statement below accurately describes the contributions of Thomson?
a) ancient Greek philosopher who proposed that matter was continuous
b) created the modern periodic table
c) proposed the modern Atomic Theory
d) discovered the existence of electrons
Which of the statements about the discovery of electrons is FALSE?
a) Because atoms are neutral, the existence of a negatively charged particle implied there must be a positively charged componen
b) Thomson proposed that electrons were small particles held within a positively charged sphe
c) Rutherford proved the plum-pudding model correct.
d) The negatively charged electron is located outside the nucleus.
In Rutherford's experiments, alpha particles
a) a. passed through a tube containing gas.
b) b. were used to bombard a cathode plate.
c) c. collided with electrons.
d) d. were used to bombard thin metal foil.
In Rutherford's experiments, most of the alpha particles
a) a. bounced back.
b) b. passed through the foil.
c) c. were absorbed by the foil.
d) d. combined with the foil.
Because most particles fired at metal foil passed straight through, Rutherford concluded that
a) a. atoms were mostly empty space.
b) b. atoms contained no charged particles.
c) c. electrons formed the nucleus.
d) d. atoms were indivisible.
Because a few alpha particles bounced back from the foil, Rutherford concluded that they were
a) a. striking electrons.
b) b. indivisible.
c) c. repelled by densely packed regions of positive charge.
d) d. magnetic.
Rutherford's experiments led him to conclude that atoms contain massive central regions that have
a) a. a positive charge.
b) b. a negative charge.
c) c. no charge.
d) d. both protons and neutrons.
A positively charged particle with mass 1.673 x 10^–24 g is a(n)
a) a. electron.
b) b. neutron.
c) c. proton
d) d. positron.
A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called a(n)
a) a. nuclide.
b) b. neutron.
c) c. electron.
d) d. isotope.
An atom is electrically neutral because
a) a. neutrons balance the protons and electrons.
b) b. nuclear forces stabilize the charges.
c) c. the numbers of protons and electrons are equal.
d) d. the numbers of protons and neutrons are equal.
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