Answer by IBG
92
http://www.hps.org/publicinformation/ate/q933.html
Answer by kumorifox
So far, there are 117 discovered elements, with 118 being the last (117 has not yet been observed). 91 are classed as metals, 7 are metalloids, and the remaining 19 are nonmetallic.
All elements from polonium onwards are radioactive, and evidence suggests that bismuth is as well. Two elements outside of this range are also radioactive. This number is 36 (37 if bismuth is included). All elements have radioactive isotopes, however.
23 are entirely synthetic, the remaining 94 are naturally occurring.
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