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7.2 Review CC
Test Description: The Atom
Instructions: Answer all questions to get your test result.
1) Which of these is the smallest particle to retain the properties of an element?
A
a molecule
B
an electron
C
an atom
D
a proton
2) Which statement is supported by the atomic theory?
A
Atoms come in different sizes, but most are visible using a simple hand lens.
B
Atoms are easily destroyed when matter is cooled or heated.
C
Atoms are made up of smaller particles called molecules.
D
Atoms combine to make all the substances on Earth.
3) The current model of the atom has electrons in a cloud surrounding the nucleus. How does the electron cloud model differ from the Bohr model?
A
The electron cloud shows a region in which electrons are likely to be found.
B
The electron cloud shows there is not empty space in an atom.
C
The cloud shows that all the electrons combine together to form one mass.
D
The electron cloud shows that electrons do not have a negative charge.
4) An atom’s mass number is 210 and its atomic number is 85. How many neutrons does the atom have?
A
295
B
210
C
85
D
125
5) Marcus wants to use two objects to compare the sizes of a proton and an electron. If he uses a basketball for a proton, which object would best represent an electron?
A
a bowling ball
B
a beach ball
C
a pea
D
a soccer ball
6) Calcium is an element. What is the smallest particle of calcium that has all the chemical properties of calcium?
A
a proton from a calcium atom
B
a molecule that contains calcium
C
an electron from a calcium atom
D
an atom of calcium
7) An atom of the element gallium (Ga) has 31 protons and 39 neutrons. What is the atomic number of gallium?
A
8
B
70
C
31
D
39
8) An atom of lead has the atomic number 82 and a mass number of 207. How many neutrons does this atom of lead have?
A
125
B
207
C
289
D
82
9) What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?
A
13
B
4
C
9
D
5
10) Atoms are the building blocks of all matter. Which of the following are the building blocks of atoms?
A
pure substances
B
molecules
C
subatomic particles
D
elements
*select an answer for all questions
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