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UNIT 2 TEST: BASIC CHEMISTRY AND BIOLOGICAL
MACROMOLECULES EXAM QUESTIONS AND
ANSWERS
Which statement is true about the electrons in the lithium atom?
A. Electrons are found in the nucleus.
B. Electrons fill the outer shell first and then the inner shell.
C. Electrons are split as evenly as possible between the first and
second shell.
D. The electrons fill the inner shell, and then one additional
electron is in the second shell. ......ANSWER........D. The electrons
fill the inner shell, and then one additional electron is in the
second shell.
Electrons fill the inner shells first.
What is the charge of a neutron?
A. Neutrons have a neutral charge.
B. Neutrons have a negative charge.
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C. Neutrons have a positive charge.
D. A neutron's charge depends on the atom in which it is found.
......ANSWER........A. Neutrons have a neutral charge.
An atom has six electrons and it is electrically neutral. How many
protons does the atom have?
A. 0
B. 12
C. 3
D. 6 ......ANSWER........D. 6
To be electrically neutral, the atom must have the same number
of protons as electrons.
An atom has 17 protons and 18 electrons. Is this atom an ion?
A. No
B. Yes ......ANSWER........B. Yes
It has unequal numbers of protons and electrons.
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If an atom has three protons and two electrons, what is the
charge of the atom?
A. -2
B. +1
C. -1
D. +2
E. Neutral, no charge ......ANSWER........B. +1
Three protons would have a charge of +3, and two electrons
would have a charge of -2.
Look at the periodic table. All atoms of the element hydrogen
(H) have the same number of protons. How many protons are in
one hydrogen atom?
A. One because that is the atomic number for hydrogen.
B. One because hydrogen is listed in the first column of the
periodic chart.
C. The number of protons varies from zero to two.
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D. There is not enough information on the periodic table to
answer this question. ......ANSWER........A. One because that is the
atomic number for hydrogen.
The atomic number is equal to the number of protons in the
nucleus of an atom.
Use the periodic table to answer this question. How many
protons are in a nitrogen (N) atom?
A. 10
B. 1
C. 28
D. 7 ......ANSWER........D. 7
The atomic number of nitrogen is seven, indicating that the
nitrogen atom has seven protons.
Assume you are looking at an atom that has eight protons in its
nucleus. Is this atom an element? If so, use the periodic table to
determine what element it is.
UNIT 2 TEST: BASIC CHEMISTRY AND BIOLOGICAL
MACROMOLECULES EXAM QUESTIONS AND
ANSWERS
Which statement is true about the electrons in the lithium atom?
A. Electrons are found in the nucleus.
B. Electrons fill the outer shell first and then the inner shell.
C. Electrons are split as evenly as possible between the first and
second shell.
D. The electrons fill the inner shell, and then one additional
electron is in the second shell. ......ANSWER........D. The electrons
fill the inner shell, and then one additional electron is in the
second shell.
Electrons fill the inner shells first.
What is the charge of a neutron?
A. Neutrons have a neutral charge.
B. Neutrons have a negative charge.
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C. Neutrons have a positive charge.
D. A neutron's charge depends on the atom in which it is found.
......ANSWER........A. Neutrons have a neutral charge.
An atom has six electrons and it is electrically neutral. How many
protons does the atom have?
A. 0
B. 12
C. 3
D. 6 ......ANSWER........D. 6
To be electrically neutral, the atom must have the same number
of protons as electrons.
An atom has 17 protons and 18 electrons. Is this atom an ion?
A. No
B. Yes ......ANSWER........B. Yes
It has unequal numbers of protons and electrons.
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If an atom has three protons and two electrons, what is the
charge of the atom?
A. -2
B. +1
C. -1
D. +2
E. Neutral, no charge ......ANSWER........B. +1
Three protons would have a charge of +3, and two electrons
would have a charge of -2.
Look at the periodic table. All atoms of the element hydrogen
(H) have the same number of protons. How many protons are in
one hydrogen atom?
A. One because that is the atomic number for hydrogen.
B. One because hydrogen is listed in the first column of the
periodic chart.
C. The number of protons varies from zero to two.
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D. There is not enough information on the periodic table to
answer this question. ......ANSWER........A. One because that is the
atomic number for hydrogen.
The atomic number is equal to the number of protons in the
nucleus of an atom.
Use the periodic table to answer this question. How many
protons are in a nitrogen (N) atom?
A. 10
B. 1
C. 28
D. 7 ......ANSWER........D. 7
The atomic number of nitrogen is seven, indicating that the
nitrogen atom has seven protons.
Assume you are looking at an atom that has eight protons in its
nucleus. Is this atom an element? If so, use the periodic table to
determine what element it is.
