Carbon Monoxide, Carbon Dioxide Density Enigma.

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Can you solve this enigma?

For simplicity, say the average relative density of oxygen is 1.00.

Add one carbon atom and you have Carbon Monoxide (CO) with a relative density of 0.98. Carbon Monoxide it lighter than air.

Add a second carbon atom and you have Carbon Dioxide with a relative density of 1.60. Carbon Dioxide is much heavier than air, and drops like a stone to ground level.

Why does the first carbon atom seem to have a relative density of -0.02, while the second carbon atom has a relative density of 0.62?