Which of the following is closest to the atomic mass of platinum (Pt)?

• A. 65.38
• B. 195.08
• C. 207.2
• D. 183.84

Answer: (B)

Verified step by step guidance

1. Understand that the atomic mass of an element is the weighted average mass of all its naturally occurring isotopes, measured in atomic mass units (amu).
2. Recognize that platinum (Pt) is a transition metal with a known atomic mass that can be found on the periodic table.
3. Compare the given options (65.38, 195.08, 207.2, 183.84) to typical atomic masses of elements near platinum on the periodic table, which is in the 190-200 amu range.
4. Recall or look up the atomic mass of platinum, which is approximately 195 amu, to identify the closest value among the options.
5. Select the value closest to the known atomic mass of platinum, which is 195.08.