Multiple Choice
Which of the following is the atomic number of aluminum (Al)?
28
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2. Atoms & Elements
Periodic Table: Element Symbols
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Which of the following is the atomic number of silicon (Si)?
A
28
B
16
C
14
D
12
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 the element silicon (Si) on the periodic table to find its atomic number.
Locate silicon (Si) in the periodic table, which is in period 3 and group 14.
Note the atomic number listed for silicon, which corresponds to the number of protons in its nucleus.
Compare the atomic number of silicon to the given options to determine the correct answer.
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