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H Chapter 3 Review Flashcards | StudBud
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H Chapter 3 Review
H Chapter 3 Review
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atomic theory
Flashcards
35 cards
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Practice quiz
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Questions
35
Answers
1
How many protons does this element have?
+3
71
174.947
2
Electrons were discovered by _______.
JJ Thomson
Ernest Rutherford
James Chadwick
John Dalton
3
Which atom has more neutrons, potassium-40 or argon-40?
argon-40
potassium-40
4
How did Bohr modify Rutherford's model of the atom?
placed electrons in energy levels
discovered the atomic nucleus
proposed the electrons are located in the nucleus
added neutrons to the nucleus
5
Who developed the "planetary" model of the atom?
Bohr
Chadwick
Thomson
Dalton
6
The picture below depicts the cathode-ray tube experiment that led to the discovery of _____.
neutrons
the nucleus
electrons
protons
7
Which of the following symbols represents a phosphorus atom that has gained three electrons?
P+4
P-3
P+3
P
8
How many electrons are in a neutral sodium atom?
12
23
11
13
9
Which scientist thought atoms were simply solid spheres?
John Dalton
James Chadwick
JJ Thomson
Ernest Rutherford
10
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 they were positively charged
because neutrons are neutral
they were deflected by the nucleus
11
Who proposed the nuclear model of the atom?
Thomson
Dalton
Bohr
Rutherford
12
Isotopes are atoms of the same element that have different numbers of ____.
electrons
neutrons
protons
electron shells
13
James Chadwick made which of the following contributions to the atomic theory?
discovered protons
discovered neutrons
discovered that atoms are neutral
discovered electrons
14
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
15
Why were some particles deflected in the experiment shown here?
They could not pass through the atoms.
They were repelled by the nucleus.
The electrons caused the particles to bounce back.
Atoms are mostly empty space.
16
Whose model of the atom is shown below?
Dalton's
Rutherford's
Bohr's
Thomson's
17
How many neutrons are in sodium-23?
11
12
14
23
18
I am going to ace the midterm.
False
True
19
Which of the following points from Dalton's atomic theory is incorrect?
Atoms can be joined, separated, or rearraged in reactions.
All atoms of the same element are identical.
All matter is composed of atoms.
Atoms cannot be created or destroyed.
20
What subatomic particle(s) are located in the nucleus?
protons and neutrons
electrons and neutrons
protons and electrons
protons only
21
What is the definition of one atomic mass unit?
1 g of any element
1 mol of any element
1/12 the mass of any atom
1/12 the mass of a carbon-12 atom
22
Whose model of the atom is shown below?
Dalton's
Rutherford's
Chadwick's
Thomson's
23
How many neutrons are in a zinc-65 atom?
65
35
40
30
24
According to Rutherford, where in the atom are electrons located?
in the nucleus
in circular orbits called electron shells
distributed evenly all throughout the atom
in the empty space surrounding the atom
25
Which of the following isotopes represents an atom that has 17 protons and 20 neutrons?
37Cl
37Ca
17Cl
35Cl
26
The Greek word "atomos" means _______.
indestructible
very small
uncuttable
invisible
27
Atoms have a _______ charge.
none of these
negative
positive
neutral
28
The number of protons in the atom is the ____.
mass number
nuclear force
atomic number
isotope number
29
How many electrons are in a Ca
+2
ion?
18
40
20
22
30
Atoms of the same element with different masses are called ____.
ions
isotopes
anions
multiples
31
Mass number can be calculated by ____.
subtracting atomic number and protons
adding protons and electrons
adding protons and neutrons
subtracting atomic number and neutrons
32
How many electrons are in an O
-2
ion?
-2
8
10
6
33
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
34
The first person to suggest the idea of atoms was ________.
Democritus
an alchemist
Dalton
Aristotle
35
The first atomic theory was proposed by ________.
Dalton
Thomson
Chadwick
Lavoisier
