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