Isotopes and Average Atomic Mass

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What is the name of the given isotope?

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What is the name of the given isotope?

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The given ion contains

electrons.

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A single ion with a 2+ charge of lead-206 contains

protons.

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A single ion with a 2+ charge of lead-206 contains

electrons.

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A single ion with a 2+ charge of lead-206 contains

neutrons.

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What is the name of the isotope of a neutral atom that has an atomic number of 30 and contains 40 neutrons?

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What is the symbol of the isotope of a neutral atom that contains 17 protons and 18 neutrons?

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What is the name of the isotope of a neutral atom that contains 29 electrons and 34 neutrons?

Multiple Choice

Gallium has two stable isotopes. The mass of gallium-69 is 68.926 amu and has an abundance of 60.11%. The mass of gallium-71 is 70.925 amu and has an abundance of 39.89%. Which is the average atomic mass of gallium?

• 69.93 amu

• 69.72 amu

• 292.47 amu

• 139.85 amu

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Oxygen has three stable isotopes. Oxygen-16 has a mass of 15.99 amu and an abundance of 99.76%. Oxygen-17 has a mass of 17.00 amu and an abundance of 0.04%. Oxygen-18 has a mass of 18.00 amu and an abundance of 0.20%. What is the average atomic mass of oxygen using this data?

Multiple Choice

Bromine has two stable isotopes. With its average atomic mass on the periodic table being 79.90 amu, which isotope is more abundant?

• Bromine-79

• Bromine-81