Multiple Choice
Which of the following is the atomic number of iron (Fe) on the periodic table?
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Multiple Choice
Which of the following is the atomic number of calcium (Ca)?
A
12
B
40
C
20
D
16
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Verified step by step guidance1
Recall that the atomic number of an element is the number of protons in the nucleus of an atom of that element.
Identify calcium (Ca) on the periodic table to find its atomic number.
Note that the atomic number is usually written above the element symbol on the periodic table.
Recognize that the atomic number of calcium is 20, which means calcium has 20 protons.
Understand that the other numbers given (12, 40, 16) represent either mass numbers or atomic numbers of different elements, but not calcium.
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