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Early Atomic Theory Review Flashcards | StudBud
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Early Atomic Theory Review
Early Atomic Theory Review
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Non-quantum Atomic theory from Democritus to Chadwick with average atomic mass and moles questions.
Flashcards
31 cards
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Questions
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Answers
1
All elements have only one isotope.
False
True
2
Who discovered the nucleus?
Ernest Rutherford
James Chadwick
Albert Einstein
J J Thomson
3
J J Thomson used cathode rays to discover
neutrons.
the nucleus.
protons.
electrons.
4
The nucleus
fills most of the atom.
is not very dense.
has no charge.
is very, very small compared to the whole atom.
5
John Dalton thought that atoms
have no mass
contain molecules
cannot be created or destroyed
are composed of smaller pieces
6
Protons have what relative charge?
-1
+1
0
depends on the atom
7
What did the oil drop experiment determine?
mass and charge of an electron
the mass and charge of the neutron
all of these
the mass and charge of the proton
8
Which of Dalton's ideas has been changed from his original atomic theory?
All matter is made of atoms.
Atoms are rearranged in chemical reactions.
Atoms of each element are different .
All atoms of one element are identical.
9
What experiment led to the discovery of protons?
oil drop
gold foil
canal rays
cathode rays
10
Lithium (atomic mass = 6.94 amu) has two isotopes, Li-6 and Li-7. Which is more abundant?
Li-7
It is impossible to tell.
They are equally abundant.
Li-6
11
An element has two isotopes: 57.9 amu (65 %) and 61.9 amu (35 %). What is its atomic mass?
29.7 amu
59.3 amu
119.8 amu
59.9 amu
12
John Dalton pictured atoms as
a nucleus surrounded by an electron cloud
small hard spheres
a plum pudding
a solar system
13
How are the percent abundance and the masses of isotopes of an element determined?
By the gold foil experiment.
By the oil drop experiment.
By using a cathode ray tube.
By using a mass spectrometer.
14
The nucleus was discovered in which experiment?
Cathode Ray Experiments
The Plum Pudding Experiment
The Oil Drop Experiment
The Gold Foil Experiment
15
What scientist did the oil drop experiment?
Millikan
Dalton
Thomson
Rutherford
16
What is the symbol for an atom of carbon (element #6) with 8 neutrons?
8C
2C
14C
6C
17
An atom has 92 protons and 143 neutrons. Its mass number is
92
235
143
51
18
Which subatomic particles are found in the nucleus?
protons
protons and electrons
neutrons
protons and neutrons
19
The atomic number of an atom is
the number of protons plus neutrons
the number of particles in the nucleus
the number of neutrons in the nucleus
the number of protons in the nucleus
20
How many protons, neutrons, and electrons does
56
Fe have (element #26)?
56, 26, 26
26, 56, 26
26, 30, 26
30, 26, 30
21
What isotope is used as the reference for atomic mass?
C-13
C-6
H-1
C-12
22
Which other idea of Dalton's has been changed?
Atoms of each element are different.
Atoms combine in small whole-number ratios.
Atoms cannot be subdivided.
All matter is made of atoms.
23
What scientist investigated canal rays?
Goldstein
Millikan
Thomson
Dalton
24
Isotopes are atoms of the same element with different
numbers of protons.
atomic numbers.
numbers of neutrons.
numbers of electrons.
25
Electrons have what relative charge?
+1
-1
0
depends on the atom
26
The person who first used the term atomos to state that matter could not be subdivided indefinitely was
Democritus
Aristotle
Dalton
Lavosier
27
Neutrons have what relative charge?
depends on the atom
-1
0
+1
28
Which subatomic particles have masses around 1 atomic mass unit?
Neutrons and protons
Neutrons only
Electrons and protons
Protons only
29
The mass number of an isotope tells
the total particles in its nucleus
the number of neutrons it has
the number of protons it has
its mass
30
Calculating average atomic mass uses what two things?
isotope mass and natural abundance
moles and Avogadro's number
charge and mass of isotopes
atomic number and mass number
31
Which item was NOT part of John Dalton's original atomic theory of matter?
Atoms cannot be created or destroyed
All matter is made of atoms.
Atoms are rearranged in chemical reactions.
All atoms have the same properties.
