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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 proton
B
an atom
C
an electron
D
a molecule
2) Which statement is supported by the atomic theory?
A
Atoms combine to make all the substances on Earth.
B
Atoms are made up of smaller particles called molecules.
C
Atoms come in different sizes, but most are visible using a simple hand lens.
D
Atoms are easily destroyed when matter is cooled or heated.
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 that electrons do not have a negative charge.
B
The electron cloud shows a region in which electrons are likely to be found.
C
The electron cloud shows there is not empty space in an atom.
D
The cloud shows that all the electrons combine together to form one mass.
4) An atom’s mass number is 210 and its atomic number is 85. How many neutrons does the atom have?
A
85
B
210
C
125
D
295
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 soccer ball
D
a pea
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
an atom of calcium
C
a molecule that contains calcium
D
an electron from a calcium atom
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
82
B
207
C
289
D
125
9) What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?
A
4
B
5
C
13
D
9
10) Atoms are the building blocks of all matter. Which of the following are the building blocks of atoms?
A
subatomic particles
B
molecules
C
pure substances
D
elements
*select an answer for all questions
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