How many protons are present in an atom of silicon (Si)?

• A. 12
• B. 28
• C. 16
• D. 14

Answer: (D)

Verified step by step guidance

1. Recall that the number of protons in an atom is equal to its atomic number, which uniquely identifies the element.
2. Look up the atomic number of silicon (Si) on the periodic table; this number represents the number of protons in a silicon atom.
3. Note that the atomic number of silicon is 14, meaning every silicon atom contains 14 protons.
4. Understand that the other numbers given (12, 28, 16) could represent other properties such as mass number or number of neutrons, but they do not indicate the number of protons.
5. Therefore, the correct number of protons in a silicon atom is the atomic number, which is 14.