Which one of the following contributes to the charge, but does NOT contribute significantly to the mass of an atom?
Chemistry Quiz

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Chemistry
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12th Grade
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28 questions
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1.
MULTIPLE CHOICE QUESTION
3 mins • 10 pts
electrons
nuclei
photons
neutrons
protons
2.
MULTIPLE CHOICE QUESTION
3 mins • 10 pts
Consider the atoms of Cu-65 and Zn-65. Both of these atoms have the same
number of electrons
number of ions
number of neutrons
mass number
number of protons
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Uranium exists in nature in the form of several isotopes; the different isotopes have different
atomic numbers
charges
numbers of electrons
numbers of neutrons
numbers of protons
4.
MULTIPLE CHOICE QUESTION
3 mins • 10 pts
Consider the atoms of Co and Co. Both of these atoms have the same
number of neutrons and electrons
number of neutrons and ions
mass number
number of photons
number of protons and electrons
5.
MULTIPLE CHOICE QUESTION
3 mins • 10 pts
A neutral iodine atom has an atomic mass number = 131. Which description below fits this atom?
39 protons, 78 neutrons, 39 electrons
53 protons, 78 neutrons, 53 electrons
52 protons, 79 neutrons, 54 electrons
53 protons, 131 neutrons, 53 electrons
54 protons, 131 neutrons, 54 electrons
6.
MULTIPLE CHOICE QUESTION
3 mins • 10 pts
A naturally occurring element consists of three isotopes. The data for the isotopes are: isotope 1: 146.9672 u, 64.792% isotope 2: 148.9638 u, 26.117% isotope 3: 149.9592 u, 9.0910%. What is the average atomic mass of this naturally occurring element?
49.254 u
147.76 u
148.63 u
148.67 u
147.88 u
7.
MULTIPLE CHOICE QUESTION
3 mins • 10 pts
All of the following are alkali metals except
Sr
Na
Fr
Cs
Rb
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