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Unit 2 Review - Section 1Atomic Structure and Mass
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Which subatomic particles are responsible for…
Element identity?Mass?
Charge?Chemical Behavior?
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Which subatomic particles are responsible for…
Element identity? ProtonsMass? Protons and neutrons
Charge? Protons and electronsChemical Behavior? electrons
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Which subatomic particles are found in the nucleus?
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Which subatomic particles are found in the nucleus?
Protons and neutrons
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Which subatomic particles have the smallest mass?
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Which subatomic particles have the smallest mass?
Electrons
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Which subatomic particles have a positive charge?
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Which subatomic particles have a positive charge?Protons
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Isotopes have the same number of protons, but different numbers of ________________.
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Isotopes have the same number of protons, but different numbers of Neutrons
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When you add up the protons and neutrons, do you getthe mass number or
the average atomic mass?
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When you add up the protons and neutrons, do you getthe mass number or
the average atomic mass? Mass number
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Which is found in the periodic table,the mass number or
the average atomic mass?
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Which is found in the periodic table,the mass number or
the average atomic mass? Average atomic mass
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An atom has 26 protons, 30 neutrons, and 26 electrons.
What is its atomic number?What is its mass number?
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An atom has 26 protons, 30 neutrons, and 26 electrons.
What is its atomic number? 26What is its mass number? 56
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An atom has 7 protons, 8 neutrons, and 7 electrons.
What element is it? What is its mass number?
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An atom has 7 protons, 8 neutrons, and 7 electrons.
What is its atomic number? nitrogenWhat is its mass number? 15
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For the isotope bromine-79,what is its mass number?
what is its atomic number?how many neutrons does it have?
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For the isotope bromine-79,what is its mass number? 79
what is its atomic number? 35how many neutrons does it have? 44
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For the isotope copper-64,how many neutrons does it have?
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For the isotope copper-64,how many neutrons does it have? 35
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For the isotope sodium-24,how many neutrons does it have?
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For the isotope sodium-24,how many neutrons does it have? 13
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For the isotope lithium-7,how many neutrons does it have?
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For the isotope lithium-7,how many neutrons does it have? 4
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For the isotope silver-109,write the isotope symbol?
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For the isotope silver-109,write the isotope symbol?
Ag109
47
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For the isotope potassium-41,write the isotope symbol?
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For the isotope potassium-41,write the isotope symbol?
K41
19
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For the isotope symbol below,write the isotope name?
Br81
35
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For the isotope symbol below,write the isotope name?
Br81
35
Bromine-81
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For the isotope symbol below,write the isotope name?
U238
92
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For the isotope symbol below,write the isotope name?
U238
92
Uranium-238
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Lithium has two naturally occurring isotopes. Using the information below, calculate the average atomic mass of lithium.
lithium-6 (mass = 6.01 amu, abundance = 7.6%) andlithium-7 (mass = 7.02 amu, abundance = 92.4%).
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Lithium has two naturally occurring isotopes. Using the information below, calculate the average atomic mass of lithium.
lithium-6 (mass = 6.01 amu, abundance = 7.6%) andlithium-7 (mass = 7.02 amu, abundance = 92.4%).
Hint: First calculate the mass contributions of each isotope!
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Lithium has two naturally occurring isotopes. Using the information below, calculate the average atomic mass of lithium.
lithium-6 (mass = 6.01 amu, abundance = 7.6%) andlithium-7 (mass = 7.02 amu, abundance = 92.4%).
Lithium-6: 6.01 amu x 0.076 = 0.46 amuLithium-7: 7.02 amu x 0.924 = 6.49 amu
Avg atomic mass = 0.46 + 6.49 =6.94 amu
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For more practice…
• http://www.sciencegeek.net/Chemistry/taters/Unit1Numbers2.htm
• http://www.sciencegeek.net/Chemistry/taters/Unit1AtomicNumbers.htm