Which element has an atom with 53 protons and 74 neutrons?

• A. Iodine-127
• B. Xenon-127
• C. Tellurium-127
• D. Cesium-127

Answer: (A)

Verified step by step guidance

1. Identify the element by its atomic number, which is the number of protons in the atom. Here, the atom has 53 protons.
2. Recall that the atomic number corresponds to a specific element on the periodic table. Find the element with atomic number 53.
3. Calculate the mass number of the atom by adding the number of protons and neutrons: \(\text{mass number} = 53 + 74\).
4. Match the mass number with the isotope notation, which is written as \(^{\text{mass number}}\text{Element}\).
5. Compare the isotope notation with the given options to identify the correct element and isotope.