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Study Guide Chapter 4 Physical
Science
1.What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in
common?
2.In Thomson’s “plum-pudding” model of the atom, the plums represent
3.An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a
mass number of
4.Which subatomic particle has the least mass?
5.If an isotope of uranium, uranium-235, has 92 protons, how many protons does
uranium-238 have?
6.How did Democritus describe atoms?
7.What is the smallest particle into which an element can be divided and still be
the same substance?
8.particle than cannot be cut
atomic number
9.negatively charged particle discovered by Thomson
10.central region of the atom
11.region where electrons are likely to be found
12.particle in the center of an atom that has no charge
nucleus
electron cloud
mass number
13.subatomic particle that has a positive charge
isotope
14.a unit of mass that describes the mass of an atom or
molecule
neutron
15.the number of protons in the nucleus of an atom
16.atom that has the same number of protons but
different numbers of neutrons
17.the sum of protons and neutrons in an atom
atom
electron
atomic mass unit (amu)
proton
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
30
Introduction to Atoms
Name ______________________________ Class ___________________ Date __________________
18.Which letter refers to the negatively charged particles?
19.Which letter refers to the positively charged particles?
20.Which letter refers to the particles with no charge?
21.Which letter refers to the dense center of the atom?
22.Who proposed this new model of an atom?
23.The raised surfaces show
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
31
Introduction to Atoms