Multiple Choice
Which element has the lowest atomic mass on the periodic table?
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4. Atoms and Elements
Atomic Mass (Simplified)
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Which element has an average atomic mass of approximately amu?
A
Barium (Ba)
B
Iodine (I)
C
Cesium (Cs)
D
Xenon (Xe)
Verified step by step guidance1
Understand that the average atomic mass of an element is the weighted average of the masses of its naturally occurring isotopes, measured in atomic mass units (amu).
Recall or look up the average atomic masses of the given elements: Barium (Ba), Iodine (I), Cesium (Cs), and Xenon (Xe). These values are typically found on the periodic table.
Compare the given average atomic mass of approximately 131.3 amu to the known average atomic masses of these elements to identify which one is closest to this value.
Note that Xenon (Xe) has an average atomic mass near 131.3 amu, which matches the value given in the problem.
Conclude that the element with an average atomic mass of approximately 131.3 amu is Xenon (Xe).
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