Critique the Following Statement Made by a Student Looking at a TEM

question 77

Multiple Choice

Critique the following statement made by a student looking at a TEM image of dolomite. "The TEM image shows regular patterns of small dots, large dots, and tiny dots. The formula for dolomite is CaMg[CO3]2. I think the large dots must be the carbonate groups."

• A) The student is correct.
• B) The student is probably correct because four atoms will make a larger mark than one atom.
• C) The student is probably incorrect because the single metal atoms have a denser arrangement of electrons than the carbonate group.
• D) The student is incorrect because the image must not be dolomite. Since there are four types of atoms, the TEM for dolomite should have four sizes of dots.

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