Multiple Choice
Which three types of information are required to calculate the average atomic mass of an element?
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2. Atoms & Elements
Atomic Mass
Multiple Choice
Which of the following is the atomic number of zirconium (Zr)?
A
41
B
39
C
40
D
42
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Verified step by step guidance1
Understand that the atomic number of an element is the number of protons in the nucleus of an atom of that element.
Recall that the atomic number uniquely identifies an element on the periodic table.
Locate zirconium (Zr) on the periodic table to find its atomic number.
Note that zirconium is in period 5 and group 4 of the periodic table.
Confirm that the atomic number of zirconium (Zr) is 40, meaning it has 40 protons.
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