Which element has 6 protons in its nucleus?

• A. Helium
• B. Carbon
• C. Nitrogen
• D. Oxygen

Answer: (B)

Verified step by step guidance

1. Understand that the number of protons in an atom's nucleus defines the element. This is known as the atomic number.
2. Recall that each element on the periodic table is uniquely identified by its atomic number, which is the number of protons in its nucleus.
3. Identify the atomic number of each element listed in the problem: Helium, Carbon, Nitrogen, and Oxygen.
4. Helium has an atomic number of 2, Carbon has an atomic number of 6, Nitrogen has an atomic number of 7, and Oxygen has an atomic number of 8.
5. Determine which element has 6 protons by matching the atomic number to the element. Carbon is the element with 6 protons in its nucleus.