Bismuth /ˈbɪzməθ/ is a chemical element that has the symbol Bi and atomic number 83.
This heavy, brittle, white crystalline trivalent other metal has a pink tinge and chemically resembles arsenic and antimony.
Of all the metals, it is the most naturally diamagnetic, and only mercury has a lower thermal conductivity.
It was long considered to be the last naturally occurring non-radioactive element, although it is now known to be very slightly radioactive, with a half-life longer than the estimated heat death of the universe.
As the toxicity of lead has become more apparent in recent years, alloy uses for bismuth metal as a replacement for lead have become an increasing part of bismuth's commercial importance.