Name the hydrocarbon and write it's structural formula (H=1, C=12)

- both b and d.

-since b and d are the closest coastlines then that makes it the most affected.

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the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.