Which element has an atomic number of $29$ (i.e., $29$ protons in the nucleus)?

• A. Zinc (Zn)
• B. Copper (Cu)
• C. Silver (Ag)
• D. Cobalt (Co)

Answer: (B)

Verified step by step guidance

1. Understand that the atomic number of an element represents the number of protons in the nucleus of its atoms.
2. Recall that each element on the periodic table has a unique atomic number that identifies it.
3. Look up the element with atomic number 29 on the periodic table.
4. Identify the element with atomic number 29 as Copper (Cu).
5. Confirm that the other options (Zinc, Silver, Cobalt) have different atomic numbers: Zinc (30), Silver (47), and Cobalt (27).