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Teacher Notes
Name Key Class Date
Atomic Structure
Subatomic Particles in Neutral Atoms
The table below contains information about several isotopes. Use the information given to fill in the blanks. Assume all atoms are neutral.
Isotope
Name
|
Nuclear Symbol
|
Atomic Number
|
Mass Number
|
# of Protons
|
# of Neutrons
|
# of Electrons
| -
calcium-40
|
|
20
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40
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20
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20
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20
| -
iron-56
|
|
26
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56
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26
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30
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26
| -
oxygen-18
|
|
8
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18
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8
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10
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8
| -
gold-197
|
|
79
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197
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79
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118
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79
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Subatomic Particles in Ions
The table below contains information about several ions. Use the information given to fill in the blanks.
Element
Name
|
Ion Symbol
|
Atomic Number
|
Mass Number
|
# of Protons
|
# of Neutrons
|
# of Electrons
| -
chlorine
|
Cl
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17
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35
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17
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18
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18
| -
silver
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Ag +
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47
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107
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47
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60
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46
| -
oxygen
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O 2
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8
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16
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8
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8
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10
| -
aluminum
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Al 3+
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13
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27
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13
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14
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10
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Average Atomic Mass
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Calculate the average atomic mass for neon if its abundance in nature is 90.5% neon-20, 0.3% neon-21, and 9.2% neon-22.
(90.5)(20 amu) + (0.3)(21 amu) + (9.2)(22 amu)
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= 20.18 amu
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100
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Calculate the average atomic mass of silver if 13 out of 25 atoms are silver-107 and 12 out of 25 atoms are silver-109.
(13)(107 amu) + (12)(109 amu)
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= 107.96 amu
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25
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Reviewing Concepts
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The mass of an atom is contained mainly in its protons and neutrons .
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The identity of an element is determined by its number of protons .
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Isotopes are atoms with the same number of protons and different number of neutrons .
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The charge of an atom or ion is determined by its number of electrons .
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B Particle X contains 9 protons, 10 neutrons, and 9 electrons. Particle Y contains 9 protons, 10 neutrons, and 10 electrons. What is the relationship between particles X and Y?
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Particles X and Y are isotopes of the same element.
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Particle X is an atom, and particle Y is an ion of the same element.
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Particle X and Y are atoms of different elements.
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There is no significant difference between particles X and Y.
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Briefly explain your answers to question 15.
Same number of protons = same element. Same number of neutrons = same isotope. Different number of electrons = different charge. X is a neutral atom. Y is a negative ion.
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