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Unit 3 Exam Review: The History of the Atom & its Structure Flashcards | StudBud
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Unit 3 Exam Review: The History of the Atom & its Structure
Unit 3 Exam Review: The History of the Atom & its Structure
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The History of the Atom & its Structure
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33 cards
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Questions
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Answers
1
What did Rutherford PREDICT?
the alpha particles would pass straight through the foil
that the alpha particles would circle around the gold foil
the alpha particles would be deflected
the alpha particles would NOT pass through the foil
2
The term that's defined as 1/12th of the mass of a carbon-12 atom.
atomic mass unit
atomic weight
mass number
atomic mass
3
If the atomic number of Element X-14 is 12, how many neutrons does it have?
26
14
2
12
4
The periodic table is organized in order of increasing . . . .
atomic number
mass number
atomic mass
atomic weight
5
Atoms are . . .
have a double + charge
+ charged
- charged
neutrally charged
6
The number of protons is always equal to the number of neutrons.
False
True
7
What did the gold-foil experiment unveil about the atom?
that electrons are negatively charged
that most of the mass is located in the nucleus of the atom
that atoms are neutrally charged
that like charges repel one another
8
Who first came up with the concept of "the atom"?
John Dalton
Democritus
Ernest Rutherford
J. J. Thomson
9
A horizontal row is also called what?
a group
a family
a period
10
Like charges attract one another.
True
False
11
How is Bohr's model different than Rutherford's atomic model?
the e- are found randomly anywhere around and in the nucleus
the e- orbit the nucleus like planets
the e- are evenly distributed amongst + charge
the e- have specific energy levels
12
Whom proposed the atomic theory?
Robert Millikan
John Dalton
Democritus
J. J. Thomson
13
What identifies an element?
its mass number
its atomic mass
its number of protons
its atomic number
14
The term 'atomos' means what?
cannot split
cannot join
cannot mix
cannot swim
15
Whom is credited with discovering the electron?
John Dalton
Robert Millikan
J.J. Thomson
Ernest Rutherford
16
The weighted average mass of an element is known as what?
its atomic weight
its atomic mass unit
its atomic mass
its mass number
17
The negatively charged beam in the cathode-ray tube traveling towards the + end was called...
canal rays
cathode rays
anode rays
18
Who developed the idea of how the periodic table is organized today?
Niels Bohr
James Chadwick
Eugen Goldstein
Henry Moseley
19
What does the TOP number represent?
atomic weight
mass number
atomic mass
atomic number
20
Discovered the charge and mass of an electron.
JJ Thomsen
Democritus
Robert Millikan
Ernest Rutherford
21
Electrons greatly affect the overall atomic mass of an element.
False
True
22
The atomic mass of H is one. Which of the isotopes is expected to be the most abundant?
3rd atom
2nd atom
1st atom
23
What did Thomson conclude regarding his experiment with the CRT?
that protons are a + charged particle of an atom
that e- are negatively charged particles of all atoms
he concluded the charge and mass of an e- (the actual value)
that an atom is mostly empty space
24
Which of the following are found in the nucleus?
protons and electrons
protons only
protons and neutrons
protons, neutrons and electrons
25
Whom is known for coining the term: nucleus?
Niels Bohr
John Dalton
Rutherford
J. J. Thomson
26
Which of the following is NOT fully upheld today regarding the atomic theory?
atoms can chemically combine to form compounds
atoms can undergo a chemical reaction when separated
all elements are composed of tiny, indivisible atoms
atoms of the same element are identical
27
Who developed the below atomic model?
J. J. Thompson
Niels Bohr
Rutherford
John Dalton
28
Isotopes have different . . .
#'s of protons
#'s of neutrons
mass numbers
#'s of electrons
29
The mass of the proton and neutron are the same.
False
True
30
The atomic number is equal to what?
the # of protons and neutrons
the # of protons
the # of neutrons
the # of electrons
31
What's responsible for the chemical behavior of atoms . . .
protons
photons
neutrons
electrons
32
What did Rutherford conclude?
most of the atom's mass is at its center
e- move about the atom like planets
atoms are mostly empty space
all of the above
33
Most elements in nature occur as a mixture of 2 or more isotopes.
False
True
