Understanding Atomic Mass and Isotopes

Calculate the average atomic mass of an element with the following isotopic composition: 70% of isotope A with an atomic mass of 10 amu and 30% of isotope B with an atomic mass of 12 amu.

• 10.6 amu

• 11.4 amu

• 11.0 amu

• 10.2 amu

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DOK Level 1: Recall

Which of the following statements correctly describes the location of protons in an atom?

• Protons are located in the electron cloud.

• Protons are located in the nucleus.

• Protons are located in the outer shell.

• Protons are located in the neutron cloud.

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DOK Level 1: Recall

An element has two isotopes: Isotope X with a mass of 20 amu and 90% abundance, and Isotope Y with a mass of 22 amu and 10% abundance. What is the average atomic mass of the element?

• 20.2 amu

• 21.8 amu

• 20.4 amu

• 21.0 amu

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DOK Level 1: Recall

What is the electrical charge of a neutron?

• Positive

• Negative

• Neutral

• Variable

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DOK Level 1: Recall

Calculate the average atomic mass of an element with isotopes having the following data: 25% of isotope C with an atomic mass of 15 amu and 75% of isotope D with an atomic mass of 16 amu.

• 15.5 amu

• 15.75 amu

• 16.0 amu

• 15.25 amu

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DOK Level 1: Recall

Which subatomic particle is found in the electron cloud of an atom?

• Proton

• Neutron

• Electron

• Nucleus

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DOK Level 1: Recall

An element has isotopes with the following data: 60% of isotope E with a mass of 30 amu and 40% of isotope F with a mass of 32 amu. What is the average atomic mass of the element?

• 30.8 amu

• 31.2 amu

• 31.0 amu

• 30.4 amu

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DOK Level 1: Recall

What is the mass of a proton in atomic mass units (amu)?

• 0 amu

• 1 amu

• 2 amu

• 0.5 amu

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DOK Level 1: Recall

Calculate the average atomic mass of an element with isotopes having the following data: 50% of isotope G with an atomic mass of 35 amu and 50% of isotope H with an atomic mass of 37 amu.

• 36.0 amu

• 35.5 amu

• 36.5 amu

• 37.0 amu

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DOK Level 1: Recall

Which of the following particles has a negative charge?

• Proton

• Neutron

• Electron

• Nucleus

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DOK Level 1: Recall