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Chem Ch.4 - Atomic Structure (Public) Flashcards | StudBud
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Chem Ch.4 - Atomic Structure (Public)
Chem Ch.4 - Atomic Structure (Public)
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Chemistry Ch.4 - Atomic Structure
Flashcards
56 cards
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Practice quiz
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Questions
56
Answers
1
How is mass number calculated?
Subtracting electrons from protons
Adding protons and neutrons
Subtracting protons from neutrons
Adding protons and electrons
2
37
Cl has an atomic number of 17. How many protons does it have?
17
20
54
37
3
23
Na has an atomic number of 11. How many protons does it have?
11
23
12
34
4
Who discovered that atoms have a central nucleus where all of their mass is concentrated?
Goldstein
Millikan
Thomson
Rutherford
5
The charge of the nucleus of an atom is:
varies
neutral
negative
positive
6
Which isotope of argon is most abundant if argon's atomic mass is 39.948 amu?
argon-36
argon-38
argon-39.948
argon-40
7
23
Na has an atomic number of 11. What is its mass number?
23
34
11
12
8
Which experiment helped determine the quantity of charge carried by electrons?
Anode Ray Tube
Oil Drop
Gold Foil
Cathode Ray Tube
9
1 mL of pure water
weighs 1 mg
weighs 1 kg
weighs 1 μg
weighs 1 g
10
Which is
NOT
part of Dalton's Atomic Theory?
Atoms are divisible
All elements are composed of atoms
All atoms of one element are alike
Atoms combine in whole number ratios
11
The mass number of neon-22 is 22.
True
False
12
In the phrase "silicon-29" the number 29 represents:
atomic number
number of neutrons
atomic mass
mass number
13
If a particle has 16 protons and 18 electrons, what would be the overall charge of the particle
2+ (plus 2)
16+ (plus 16)
0 (zero)
2- (negative 2)
14
The smallest particle of an element that retains its identity in a chemical reaction is a(n):
atom
neutron
compound
proton
15
Which of the following is correct?
protons are positive and have no mass
electrons are neutral and have essentially no mass
electrons are negative and have essentially no mass
neutrons are negative and have mass
16
What experiment helped prove the existence of protons?
anode ray tube
cathode ray tube
oil drop
gold foil
17
Who discovered the existence of electrons?
Chadwick
Goldstein
Millikan
Thomson
18
Who discovered the existence of neutrons?
Millikan
Goldstein
Thomson
Chadwick
19
Carbon-13 has 6 protons. How many neutrons does it have?
13
19
7
6
20
Carbon-13 has 6 protons. What is the atomic number?
13
19
7
6
21
Every aluminum-27 atom has 27 protons and 27 electrons.
True
False
22
The "plum pudding" model of an atom came from:
Thomson
Rutherford
Millikan
Goldstein
23
If an atom has a mass number is 65 and an atomic number is 30, how many electrons does it have?
35
65
30
95
24
An atom that has an atomic number of 11 and a mass number of 23 has:
23 neutrons
12 neutrons
34 neutrons
11 neutrons
25
37
Cl has an atomic number of 17. How many electrons does it have?
54
37
17
20
26
Atomic number is the number of:
sum of protons and electrons
sum of protons and neutrons
neutrons
protons
27
23
Na has an atomic number of 11. How many protons and neutrons does it have?
11
23
12
34
28
An electron is repelled by a negatively charge particle.
False
True
29
Which subatomic particles are located in the nucleus.
neutrons and electrons
protons and electrons
protons and neutrons
protons only
30
The atomic mass unit is defined as the mass of 1/12 of a calcium-12 atom.
False
True
31
The nuclei of an element's isotopes contain different numbers of protons.
True
False
32
How does the mass of a proton compare to the mass of an electron?
electrons have more mass than a proton
protons have no mass
protons have more mass than an electron
they have the same mass
33
How is atomic mass calculated?
weighted average of the ions
weighted average of the isotopes
Subtracting protons from neutrons
Adding protons and neutrons
34
Who calculated the mass of an electron after determining the charge of an electron?
Goldstein
Rutherford
Millikan
Thomson
35
37
Cl has an atomic number of 17. How many neutrons does it have?
37
54
17
20
36
Who came up with a formula for the mass of an electron if the charge could be determined?
Goldstein
Millikan
Rutherford
Thomson
37
Who discovered the existence of protons?
Goldstein
Thomson
Millikan
Chadwick
38
Mass number is the
number or neutrons and electrons
number of protons
number of protons and neutrons
number of protons and electrons
39
Carbon-13 has 6 protons. What is the mass number?
7
13
6
19
40
isotopes vary by:
number of neutrons and atomic mass
number of protons and mass number
number of neutrons and atomic number
number of neutrons and mass number
41
An atom with 4 protons and 5 neutrons has an atomic number of:
9
5
1
4
42
23
Na has an atomic number of 11. How many electrons does it have?
11
34
12
23
43
The weighted average mass of an atom is called:
mass number
atomic number
atomic mass
atomic weight
44
Which experiment helped determine that atoms have a nucleus, disproving the plum pudding model?
Cathode Ray Tube
Oil Drop
Gamma Ray / Fission
Gold Foil
45
Carbon-13 has 6 protons. How many protons and neutrons does it have?
19
13
6
7
46
23
Na has an atomic number of 11. How many neutrons does it have?
12
23
34
11
47
Carbon-13 has 6 protons. How many electrons does it have?
7
19
6
13
48
The atomic mass of carbon is 12.001 The most prevalent isotope must be:
not enough information
carbon-13
carbon-14
carbon-12
49
An atom with 10 protons and 11 neutrons has:
21 electrons
1 electron
10 electrons
11 electrons
50
1 liter of pure water
weighs 500 g
weighs 1 kg
weighs 1 lb
weighs 1 g
51
An atom that has 7 protons and 9 neutrons has a mass number of:
9
7
16
2
52
Which experiment helped determine the existence of electrons?
Oil Drop
Anode Ray Tube
Cathode Ray Tube
Gold Foil
53
Determine the number of neutrons an atom has by
subtracting atomic number from mass number
adding atomic number and mass number
adding atomic number and atomic mass
subtracting atomic number from atomic mass
54
The mass number is generally equal to or greater than the atomic number.
True
False
55
37
Cl has an atomic number of 17. What is its mass number?
54
17
20
37
56
How does the mass of a proton compare to the mass of a neutron?
Neutrons have almost 2000 times less mass.
None of these.
Protons have almost 2000times less mass.
They have the same mass.
