Periodic Table - What's official?
I am about to take an exam on Mon. 3rd May.
My chemistry book says that there are 92 natural elements and 20 man made ones, making 112.
But, as I see it there are 118, of which I believe 116, as 113 and 115 were claimed in Feb. 2004. 116 is short live and so are 117 and 118 (which only lasts milliseconds before decomposing to 116).
What is the correct number "OFFICIALLY", cause if I answer it incorrectly.....????