Without specific information on the context of the models mentioned or how the colors are being used to represent different elements, I can't definitively say what color the blue atom should be. In many molecular models:
- White often represents hydrogen.
- Black typically represents carbon.
- Red usually stands for oxygen.
- Grey may represent other elements or sometimes carbon as well.
If you can provide more context about what the blue atom represents, I can give a more accurate response.
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