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?

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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?

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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