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