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Unit 7 Chapter 4 ATOMS Review Flashcards | StudBud
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Unit 7 Chapter 4 ATOMS Review
Unit 7 Chapter 4 ATOMS Review
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Atoms Review
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1
One isotope of uranium is U-238. How many protons and neutrons does it have?
92 protons & 146 neutrons
238 protons & 238 neutrons
92 protons & 238 neutrons
92 protons & 92 neutrons
2
present atomic theory, the location of an electron in an atom cannot be pinpointed exactly.
True
False
3
Particles of matter that make up protons and neutrons are ____.
Mass number
electrons
isotopes
atoms
4
Neutrons and electrons have almost the same mass.
False
True
5
Protons and neutrons are found in the nucleus of an atom.
False
True
6
Dalton's model of an atom is best described as
a plum pudding
an electron cloud
a solar system
a solid sphere
7
The symbol for chlorine is C.
True
False
8
An object has a mass of 10 grams and a volume of 2 mL. What is the density of the object?
20 g/ml
0.2 g/ml
5 g/ml
12 g/ml
9
The maximum number of electrons in the second energy level of an atom is 4.
True
False
10
Who provided evidence for the existence of a nucleus in an atom?
J. J. Thomson
John Dalton
Ernest Rutherford
Democritus
11
An atom of K has an A.Mass of 39 amu & an A. Number of 19. It has 20 neutrons in its nucleus.
False
True
12
All atoms of an element have the same
mass number
atomic number
number of isotopes
number of neutrons
13
The atomic number of an element is determined by its number of protons.
True
False
14
A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is ____.
52
26
30
56
15
The number of protons in one atom of an element is that element’s
isotope.
atomic number
mass number
balanced charge
16
Atoms have no electric charge because they
have an equal number of charged and noncharged particles.
have an equal number of neutrons and protons.
have an equal number of electrons and protons.
have neutrons in their nuclei.
17
Which statement is true about oxygen-17 and oxygen-18?
They are isotopes of oxygen.
They do not have the same number of protons
The have the same mass number.
Their atoms have an identical mass.
18
The subatomic particle that J. J. Thomson discovered has a(an) positive charge.
True
False
19
The region around the nucleus occupied by the electrons is called the negative zone.
True
False
20
The central core of an atom is called the hub.
True
False
21
If element Q has 11 protons, its atomic mass is 11.
True
False
22
An atom's mass number equals the number of
protons plus the number of neutrons
protons
neutrons.
protons plus the number of electrons.
23
Neutrons and protons are found in the nucleus of an atom.
True
False
24
Which subatomic particle has a negative charge?
proton
alpha particle
electron
Neutron
25
Atoms of the same element with different numbers of neutrons are called
radioactive elements
isotopes
metalloids
metals
26
Oxygen has atomic number 8. This means that an oxygen atom has
a total of eight protons and electrons
a total of eight neutrons and electrons.
eight neutrons in its nucleus.
eight protons in its nucleus.
27
To find the number of neutrons in an atom, you would subtract
atomic number from electron number
atomic number from mass number
isotope number from atomic number.
mass number from atomic number
28
J. J. Thomson’s experiments provided evidence that an atom
contains negatively charged particles.
is the smallest particle of matter.
has a negative charge
has a positive charge.
29
In Bohr’s model of the atom, electrons move in fixed orbits around the nucleus.
True
False
30
The nuclei of isotopes contain different numbers of protons.
True
False
31
Each inner energy level of an atom has a maximum number of ____ it can hold.
protons
electrons
neutrons
quarks
32
Which statement about subatomic particles is NOT true?
Protons and neutrons have almost the same mass
Unlike protons and electrons, neutrons have no charge.
Protons and neutrons have the same charge.
Protons and electrons have opposite charges.
33
An electron is a particle with
no charge, found outside the nucleus
a negative charge, found in the nucleus
a positive charge, found in the nucleus
a negative charge, found outside the nucleus
34
Which of the following most accurately represents John Dalton’s model of the atom?
a tiny,solid sphere with an unpred. Mass for a given element
a hollow sphere with a dense nucleus
a sphere that is hollow throughout
a tiny, solid sphere with a predict mass for a given element
35
Which of the following is NOT part of John Dalton’s atomic theory?
All elements are composed of atoms.
All atoms of the same element have the same mass.
Atoms contain subatomic particles.
A compound contains atoms of more than one element.
36
Which particle is the least massive?
proton
neutron
electron
neutron
37
In Niels Bohr’s model of the atom, electrons move
like planets orbiting the sun.
like popcorn in a popcorn popper
like beach balls on water waves.
like balls rolling down a hill
38
The mass of an electron is about equal to the mass of a proton.
True
False
39
A chemical symbol represents the ____ of an element.
structure
group
name
reaction
40
One of the first people to state that matter is made up of atom was
Dalton
Aristotle
Rutherford
Democritus
41
The number of neutrons in an atom equals the
atomic number plus number of electrons
mass number minus atomic number
atomic number minus mass number
mass number plus atomic number
42
In an atomic model that includes a nucleus, positive charge is
spread evenly throughout an atom
concentrated in the center of an atom.
concentrated at multiple sites in an atom.
located in the space outside the nucleus.
43
Who provided the first evidence that atoms contain subatomic particles?
Rutherford
Thomson
Bohr
Dalton
44
Two isotopes of carbon are c-12 and c -14. These isotopes differ from one another by 2 protons.
True
False
45
Almost all the mass of an atom is located in its
electron
electron cloud
protons
nucleus
46
Atoms emit energy as light when
electron move to a lower energy level
protons move to a higher energy level
electrons move to a higher energy level
protons moves to a lower energy level
47
The atomic number of sulfur is 16. How many electrons are there in an atom of sulfur-34?
50
34
16
18
48
Rutherford’s gold foil experiment provided evidence for which of the following statements?
There is a dense, + charged mass in the center of an atom.
Gold is not as dense as previously thought.
- and + charges are spread evenly throughout an atom.
Alpha particles have a positive charge.
49
What does the electron cloud model describe?
the most likely locations of electrons in atoms
the number of electrons in an atom
the precise locations of electrons in atoms
the mass of the electrons in an atom
50
A particle that moves around the nucleus is a(n) ____.
neutron
proton
electron
quark
