Q. How many electrons can occupy the first energy level of an atom?
Solution
The first energy level can hold a maximum of 2 electrons.
Correct Answer:
A
— 2
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Q. If an atom has 6 protons and 6 neutrons, what is its atomic mass?
Solution
Atomic mass is the sum of protons and neutrons. 6 protons + 6 neutrons = 12.
Correct Answer:
B
— 12
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Q. If an atom has an atomic number of 15, how many electrons does it have?
Solution
An atom with an atomic number of 15 has 15 electrons, assuming it is neutral.
Correct Answer:
A
— 15
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Q. What determines the chemical properties of an element?
-
A.
Number of neutrons
-
B.
Number of protons
-
C.
Number of electrons
-
D.
Mass number
Solution
The chemical properties of an element are determined by the number of electrons.
Correct Answer:
C
— Number of electrons
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Q. What is the atomic number of an element?
-
A.
Number of neutrons
-
B.
Number of protons
-
C.
Number of electrons
-
D.
Sum of protons and neutrons
Solution
The atomic number is defined as the number of protons in an atom.
Correct Answer:
B
— Number of protons
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Q. What is the charge of a proton?
Solution
A proton has a positive charge of +1.
Correct Answer:
C
— +1
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Q. What is the mass of an electron compared to a proton?
-
A.
Equal
-
B.
Much larger
-
C.
Much smaller
-
D.
Slightly larger
Solution
The mass of an electron is much smaller than that of a proton.
Correct Answer:
C
— Much smaller
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Q. What is the maximum number of electrons in the third energy level?
Solution
The third energy level can hold a maximum of 18 electrons.
Correct Answer:
C
— 18
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Q. Which of the following is a neutral particle in an atom?
-
A.
Proton
-
B.
Electron
-
C.
Neutron
-
D.
Ion
Solution
A neutron is a neutral particle in an atom.
Correct Answer:
C
— Neutron
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Q. Which particle is found in the nucleus of an atom?
-
A.
Electron
-
B.
Proton
-
C.
Neutron
-
D.
Both Proton and Neutron
Solution
Both protons and neutrons are found in the nucleus of an atom.
Correct Answer:
D
— Both Proton and Neutron
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