I can't tell if you're referring to the planet or the element. The radius of the planet is about 1.516 x 10^3 miles.
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Mercury's mass in scientific notation is 3.3010 x 1023 kg.
The Diameter of Mercury is 4,880 Kilometers.
One possible answer is Hg.
.0000000001
It's not necessary to put numbers of this size into scientific notation but if you really have to, go with 4.125 x 10^0