Which of the following is the number of protons in a boron atom?

• A. 4
• B. 5
• C. 6
• D. 11

Answer: (B)

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 boron on the periodic table; boron has an atomic number of 5.
3. Understand that the atomic number (number of protons) determines the element's identity, so boron must have 5 protons.
4. Verify that the other options (4, 6, 11) correspond to different elements: 4 is beryllium, 6 is carbon, and 11 is sodium.
5. Conclude that the correct number of protons in a boron atom is 5.