Metals have a propensity
toward quite high density
but none has higher density than this.
And if you ever get the yen
you'll find it in the nib of your pen
(where it is quite easy to miss).
Toxic and named for its smell,
perhaps it is just as well
it's only parts per trillion in the crust.
You may or may not be surprised
to find it octup'ly ionized,
but try to avoid it if it's ground to dust.