What is the heaviest element?

What do you mean by "heaviest"? If you have a lot of feathers, it weighs more than a little bit of lead! There are two ways to answer this question. One is what is the element with the highest atomic weight, and what is the element with the highest density. The element with the highest atomic weight is the heaviest for the same number of atoms, and the most dense element is the heaviest element for the same volume of material.

Uranium (U) (atomic number 92) is the naturally occurring element with the highest atomic weight.
Ununoctium (Uuo) (atomic number 118) is the heaviest synthetic element, although only a couple of atoms have ever been made!

The most dense element is osmium (Os), which a density of 22.61 grams per cm³ (which is 22.61 times more dense than water!) That's almost twice the density of lead!

See the Related Question below for more information about the most dense elements.

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First answer by ID3523984398. Last edit by Quirkyquantummechanic. Contributor trust: 1288 [recommend contributor]. Question popularity: 16 [recommend question]