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Historical Development of the Atom Flashcards | StudBud
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Historical Development of the Atom
Historical Development of the Atom
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This a review for a major test that covers the historical development of the Modern Atomic Theory.
Flashcards
34 cards
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Questions
34
Answers
1
This scientist developed a mathematical equation to describe the motion of electrons.
Dalton
Thomson
Schdrodinger
Bohr
2
The most modern model contains "probability regions" called orbitals where ______ move.
protons
quarks
electrons
neutrons
3
Proposed the atomic theory in 1803
John Dalton
Aristotle
Democritus
Neils Bohr
4
Carbon has 3 isotopes. Why is carbon's mass on the Periodic Table 12.011 amu?
Carbon-14 is the most prevalent isotope
Carbon-13 is 1.1% abundant
Carbon-12 is by far the most abundant isotope
Carbon-13 has only a negligible amount of abundance
5
Found on the periodic table & equals the number of protons in an atom.
Proton Count
Mass Number
Atomic Number
Atomic Mass
6
The sum of protons + neutrons
atomic mass
atomic number
proton count
mass number
7
What particle(s) is/are in the nucleus?
neutron
proton
electron and protons
both proton and neutron
8
All elements relative masses are compared to this isotope:
Carbon-14
Carbon-12
Hydrogen-1
Oxygen-16
9
The small dense positive nucleus was supported by what evidence?
the deflections in the cathode ray experiment
the cathode was attracted to the anode
the particle nature of electrons
the deflections in the Gold Foil experiment
10
Rejected the idea of an indivisible particle. Thought everything was made of 4 elements: fire, water, earth, and water.
Thomson
Bohr
Democritus
Aristotle
11
Pick the correct order of scientist involved in the development of the atom.
Dalton, Bohr, Democritus, Thomson, Rutherford, Quarks
Dalton, Thomson, Rutherford, Bohr, Schrodinger with others
Democritus, Thomson, Bohr, Rutherford and many others
Democritus, Dalton, Thomson, Bohr, Rutherford and quarks
12
Proposed that electrons have wave-like behavior.
Schrodinger
Max Planck
Heisenberg
de Broglie
13
Believed matter could be divided until an indivisible particle is reached. Named it atomos.
Dalton
Democritus
Max Planck
Greek philosophers
14
What is the relative mass of an electron?
2000 x mass of neutron
1
1/1840 mass of proton
1840 mass of proton
15
More than 99% of alpha particles passed straight through the gold foil, which proves the atom
is mostly empty space
the atom is radioactive
has a dense positive nucleus
has electrons that move in orbitals
16
Occured in the late 1700s that allowed scientist to productively work on the atomic theory
Dalton's atomic theory
Better equipment
cathode ray tubes
alchemy
17
The correct order of the development of the model of the atom
solid sphere, planetary, Bohr, plum pudding
sphere, plum pudding, planetary, Bohr, quantum
plum pudding, Bohr, quantum mechanical
18
Established the term "quanta" that is a "packet of energy".
Max Planck
Thomson
Rutherford
Dalton
19
He stated the electron can circle the nucleus in a fixed path with a fixed amount of energy
Bohr
Thomson
Rutherford
Dalton
20
Discovered the neutron.
Bohr
Thomson
Chadwick
Goldstein
21
An atom is neutral because
neutrons = electrons
protons = electrons
protons + neutrons = electrons
protons = neutrons
22
How many protons, neutrons, and electrons in Bromine-80?
80, 35, 45
35, 45, 35
35, 35, 45
80, 45, 35
23
For which of the following did Rutherford's Gold Foil experiment provide evidence?
the atom is mostly empty space and has a dense positive nucleus
the atom is mostly empty space
the atom is made of electrons
the atom has a positive nucleus
24
Atoms of the same element with different number of neutrons.
Isotopes
atomic number
atomic mass
Allotropes
25
Mass Number
-
Atomic Number =
protons + neutrons
neutrons
electrons
protons
26
Discovered the proton.
Chadwick
Goldstein
Millikan
Dalton
27
Which model is represented in the illustration?
Plum Pudding
Quantum Mechanical
Solid Sphere
Bohr Model
28
Carbon-12 is assigned the atomic mass unit as a reference isotope
14 amu
13 amu
1 amu
12 amu
29
Which statement is true about subatomic particles?
proton and neutron are about the same mass
protons are tiny compared to neutrons
protons and electrons are about the same mass
neutrons are tiny
30
The image could also represent what other scientist's model of the atom?
JJ Thomson
Democritus
Rutherford
Bohr
31
Plum Pudding Model of the atom was described by this scientist.
Schdrodinger
Thomson
Bohr
Dalton
32
The cathode ray tube experiments were used for the discovery of
protons and electrons
neutrons
the nucleus
protons and neuitrons
33
J.J. Thomson's cathode ray tube provided evidence for which of the following atomic particles?
like charges attract
protons
electrons
nucleus
34
Determined the mass of an electron through his oil drop experiment.
Millikan
Bohr
Rutherford
Dalton
