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Atomic Theory
Atomic Theory
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atomic theory
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41 cards
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Answers
1
Who developed the "planetary" model of the atom?
Thomson
Bohr
Dalton
Chadwick
2
How did Bohr modify Rutherford's model of the atom?
placed electrons in energy levels
added neutrons to the nucleus
proposed the electrons are located in the nucleus
discovered the atomic nucleus
3
Whose model of the atom is shown below?
Rutherford's
Chadwick's
Dalton's
Thomson's
4
The number of protons in the atom is the ____.
atomic number
mass number
isotope number
nuclear force
5
Who proposed the nuclear model of the atom?
Rutherford
Bohr
Thomson
Dalton
6
How many neutrons are in sodium-23?
12
14
11
23
7
The picture shown below represents which of the following concepts?
law of conservation of mass
Law of definite proportions
Dalton's atomic theory
law of multiple proportions
8
The law of definite proportions was developed by _____.
Antoine Lavoisier
Niels Bohr
Joseph Proust
John Dalton
9
Atoms of the same element with different masses are called ____.
isotopes
multiples
anions
ions
10
Which of the following isotopes represents an atom that has 17 protons and 20 neutrons?
17Cl
35Cl
37Cl
37Ca
11
One of the primary goals of ancient alchemists was to _______.
transform base metals into gold
discover what atoms were made of
transform a proton into a neutron
develop the law of conservation of mass
12
According to Rutherford, where in the atom are electrons located?
in the nucleus
in circular orbits called electron shells
in the empty space surrounding the atom
distributed evenly all throughout the atom
13
What is the atomic number of
207
Pb?
207
84
125
82
14
Which of the following points from Dalton's atomic theory is incorrect?
All atoms of the same element are identical.
Atoms cannot be created or destroyed.
Atoms can be joined, separated, or rearraged in reactions.
All matter is composed of atoms.
15
Atoms have a _______ charge.
positive
neutral
negative
none of these
16
Which of the following symbols represents a phosphorus atom that has gained three electrons?
P-3
P+3
P
P+4
17
How many electrons are in a Ca
+2
ion?
40
22
20
18
18
The smallest subatomic particle is the ______.
neutron
electron
none of these; they are all the same size
proton
19
The Greek word "atomos" means _______.
uncuttable
very small
indestructible
invisible
20
Why were some particles deflected in the experiment shown here?
They could not pass through the atoms.
Atoms are mostly empty space.
The electrons caused the particles to bounce back.
They were repelled by the nucleus.
21
Why were some of the alpha particles in Rutherford's experiment able to pass through the foil?
because atoms contain a large amount of empty space
because neutrons are neutral
they were deflected by the nucleus
because they were positively charged
22
James Chadwick made which of the following contributions to the atomic theory?
discovered neutrons
discovered electrons
discovered protons
discovered that atoms are neutral
23
Electrons were discovered by _______.
JJ Thomson
Ernest Rutherford
James Chadwick
John Dalton
24
Which scientist thought atoms were simply solid spheres?
John Dalton
JJ Thomson
James Chadwick
Ernest Rutherford
25
Whose model of the atom is shown below?
Thomson's
Bohr's
Rutherford's
Dalton's
26
How many electrons are in a neutral sodium atom?
23
12
13
11
27
Isotopes are atoms of the same element that have different numbers of ____.
electron shells
electrons
protons
neutrons
28
The picture below depicts the cathode-ray tube experiment that led to the discovery of _____.
protons
electrons
the nucleus
neutrons
29
Anions are ____.
positive ions formed by losing electrons
negative ions formed by losing electrons
negative ions formed by gaining electrons
positive ions formed by gaining electrons
30
How many electrons are in an O
-2
ion?
8
6
-2
10
31
What subatomic particle(s) are located in the nucleus?
protons and neutrons
protons only
protons and electrons
electrons and neutrons
32
Atoms that lose electrons become ____.
positive ions
isotopes
negative ions
radioactive
33
Which of the following statements supports the law of definite proportions?
The mass of the reactants is always the same as the products
All atoms of the same element are identical.
Water is always 89% oxygen and 11% hydrogen.
All matter is composed of atoms.
34
The mass number of an atom can be determined by ___.
adding protons and neutrons
subtracting atomic number and protons
adding protons and electrons
subtracting neutrons and protons
35
The first person to suggest the idea of atoms was ________.
an alchemist
Democritus
Aristotle
Dalton
36
Which of the following was accomplished by Ernest Rutherford?
performed experiments with cathode ray tubes
discovered that atoms contain large amounts of empty space
developed the plum pudding model of the atom
proposed the first atomic theory
37
Mass number can be calculated by ____.
subtracting atomic number and protons
adding protons and electrons
adding protons and neutrons
subtracting atomic number and neutrons
38
How many neutrons are in a zinc-65 atom?
65
35
40
30
39
The first atomic theory was proposed by ________.
Thomson
Chadwick
Dalton
Lavoisier
40
Neutrons have a ________ charge and are found _________.
positive, in the nucleus
neutral, in the nucleus
neutral, in the empty space around the nucleus
negative, in the electron shells
41
The law of conservation of mass was developed by _______.
John Dalton
Niels Bohr
Antoine Lavoisier
Joseph Proust
