Question

plz help what does it mean to synthesize an element in lab ?

Answer 1

My notes has :

The 14 elements found between actinium (Ac) and rutherfordium (Rf) in Period 7 are called the actinides. The first four actinides can be found naturally on Earth, while the rest have only been synthesized in a laboratory.

Answer 2

http://en.wikipedia.org/wiki/Synthetic_element

Answer 3

i think it will help you

Answer 4

we've made them, artificially. for whatever reason, the elements with those atomic numbers haven't been found in nature (yet). We synthesize larger elements by smashing together smaller ones and hope that the nuclei stick together long enough for us to record it, and we have a new element. We can synthesize naturally occuring elements, too, but nature has already made those for us.
see the link above, it's pretty good

Answer 5

@sara12345

Answer 6

oh it says they're radioactive and half life is much smaller than age of earth, so they would have disappeared

Answer 7

or usedup by now

Answer 8

yaa

Answer 9

if thats the case would the Uranium and other radioactive metals also gona disappear after few decades/centuries ?