Which element has 50 protons (atomic number $50$)?

• A. Tin ($Sn$)
• B. Indium ($In$)
• C. Antimony ($Sb$)
• D. Tellurium ($Te$)

Answer: (A)

Verified step by step guidance

1. Understand that the atomic number of an element represents the number of protons in its nucleus.
2. Identify that the problem asks for the element with 50 protons, which means the element with atomic number 50.
3. Recall or consult the periodic table to find the element whose atomic number is 50.
4. Note that the element with atomic number 50 is Tin, which has the chemical symbol Sn.
5. Confirm that the other options (Indium, Antimony, Tellurium) have different atomic numbers and thus different numbers of protons.