2. Atoms & Elements

Atomic Mass

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Which instrument is commonly used to measure the mass of atoms?
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Which of the following numerical setups can be used to calculate the atomic mass of the element bromine, given that bromine has two isotopes: Br-79 (abundance 50.69%, mass 78.918 amu) and Br-81 (abundance 49.31%, mass 80.916 amu)?
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Which of the following correctly represents the symbol for an atom of carbon with atomic number 6 and mass number 14?
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Given the following atoms and their atomic masses: Hydrogen (1.008 u), Carbon (12.01 u), Oxygen (16.00 u), and Iron (55.85 u), which atom has the highest atomic mass?
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Which of the following best describes the difference between mass number and atomic mass?
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Which of the following is the number of protons in a chlorine atom?
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Approximately how many times heavier is a helium (He) atom compared to a hydrogen (H) atom?
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Which of the following elements has the greatest atomic mass?
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Chlorine has an atomic number of 17 and contains 18 neutrons. What is its mass number?
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Which of the following is closest to the atomic mass of lithium?
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Which of the following is the atomic mass of fluorine?
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Three isotopic forms of potassium exist: ³⁹K, ⁴⁰K and ⁴¹K. Potassium has an atomic mass of 39.0983 amu. Potassium-40 has an isotopic mass of 39.9640 amu and natural abundance of 0.0117%. Potassium-41 has an isotopic mass of 40.9618 amu and natural abundance of 6.7302%. What is the isotopic mass of Potassium-39?
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Which of the following elements has the lowest atomic mass?
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What is the atomic number for potassium?
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Which of the following is closest to the atomic mass of calcium (Ca)?
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