Which element has 76 protons in its nucleus?

• A. Osmium (Os)
• B. Iridium (Ir)
• C. Tungsten (W)
• D. Platinum (Pt)

Answer: (A)

Verified step by step guidance

1. Recall that the number of protons in the nucleus of an atom defines the atomic number of an element.
2. Identify the atomic number associated with each element given in the options: Osmium (Os), Iridium (Ir), Tungsten (W), and Platinum (Pt).
3. Use the periodic table to find the atomic number for each element. For example, Osmium has an atomic number of 76, meaning it has 76 protons.
4. Compare the atomic numbers to the given number of protons (76) to determine which element matches this number.
5. Conclude that the element with 76 protons is the one whose atomic number is 76, which is Osmium (Os).