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