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An atom has 20 electrons and 20 neutrons. What is the atomic mass of this atom if it also has 20 protons?
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2. Atoms & Elements
Atomic Mass
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Which of the following is the atomic mass of mercury (Hg)?
A
200.59
B
207.2
C
183.84
D
195.08
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Understand that the atomic mass of an element is the weighted average mass of all its naturally occurring isotopes, measured in atomic mass units (amu).
Recognize that mercury (Hg) is a chemical element with a specific atomic mass listed on the periodic table.
Recall or look up the atomic mass of mercury on a reliable periodic table source, which is typically given to two decimal places.
Compare the given options (207.2, 183.84, 195.08, and 200.59) to the known atomic mass of mercury from the periodic table.
Select the value that matches the known atomic mass of mercury, which is approximately 200.59 amu.
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