Which of the following elements has the greatest atomic number?

• A. K
• B. Na
• C. Cl
• D. Br

Answer: (D)

Verified step by step guidance

1. Recall that the atomic number of an element corresponds to the number of protons in its nucleus and determines its position in the periodic table.
2. Identify the atomic numbers of the given elements: Potassium (K), Sodium (Na), and Chlorine (Cl). You can find these values by looking at a periodic table.
3. Compare the atomic numbers of K, Na, and Cl to determine which one is the greatest among them.
4. Note that the problem states the correct answer is Bromine (Br), which is not listed in the options. Find the atomic number of Br and compare it with those of K, Na, and Cl.
5. Conclude that Bromine (Br) has a higher atomic number than K, Na, and Cl, which explains why it is the correct answer despite not being listed initially.