How many protons are present in an atom of the element cobalt (Co)?

• A. 27
• B. 30
• C. 12
• D. 59

Answer: (A)

Verified step by step guidance

1. Identify the element given in the problem, which is cobalt (Co).
2. Recall that the number of protons in an atom is equal to the atomic number of the element.
3. Look up the atomic number of cobalt on the periodic table. The atomic number is usually found above the element symbol.
4. The atomic number of cobalt corresponds to the number of protons in one atom of cobalt.
5. Conclude that the number of protons in a cobalt atom is equal to its atomic number.