Which element has 15 protons in its nucleus?

• A. Nitrogen (N)
• B. Phosphorus (P)
• C. Sulfur (S)
• D. Chlorine (Cl)

Answer: (B)

Verified step by step guidance

1. Recall that the number of protons in the nucleus of an atom is called the atomic number, which uniquely identifies an element.
2. Look up the atomic numbers of the given elements: Nitrogen (N), Phosphorus (P), Sulfur (S), and Chlorine (Cl).
3. Nitrogen has an atomic number of 7, meaning it has 7 protons.
4. Phosphorus has an atomic number of 15, meaning it has 15 protons.
5. Since the question asks for the element with 15 protons, identify Phosphorus (P) as the correct element.