Structure Of The Atom Worksheet With Answer Key Page 2
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22Critical Thinking Questions
1
2
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H
H
H
1. How many protons are found in each of the following:
? in
? in
?
1
1
1
Each has one proton, given by the atomic number of one.
1
2
3
H
H
H
2. How many neutrons are found in each of the following:
? in
? in
?
1
1
1
2
1
3
H
has
zero
neutrons
H
has
one
neutron
H
has
two
neutrons
1
1
1
Calculate the number of neutrons by taking the mass number and subtracting the atomic
number.
1
2
3
H
H
H
3. How many electrons are found in each of the following:
? in
? in
?
1
1
1
Each has one electron. Every atom has the same number of electrons as protons.
4. What structural characteristics do all hydrogen atoms have in common?
Each hydrogen atom has the same number of protons (1) and the same number of
electrons (1).
5. What structural characteristics do all carbon atoms have in common?
Each carbon atom has the same number of protons (6) and the same number of electrons
(6).
6. What does the mass number tell you? Can you find the mass number of an element on the
periodic table?
It tells you the total number of protons plus neutrons. The mass number is
not found on the periodic table.
7. What does the atomic number tell you? Can you find the atomic number of an element on
the periodic table?
It tells you the number of protons that an atom has. The atomic number
is found on the periodic table.
The term “isotope” refers to an atom that has the same number of
8. Define the term isotope.
protons as another atom, but a different number of neutrons.
9. How does one isotope of carbon differ from another isotope of carbon?
The isotopes have different numbers of neutrons (but the same number of protons).
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