2006-11-04 08:38:35 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Most of the elements in the periodic table are natural, but all of the lanthanoid, actinoid, and radioactive elements are synthesized...or manmade!
2006-11-04 09:29:40 · answer #1 · answered by S. Sharma 1 · 2⤊ 0⤋
Mr. Z is the most correct of the above answers, however, technetium (number 43) is also man made.
So there are 91 naturally occurring elements and 25 man made elements (as of today).
Get an "A".
2006-11-04 13:06:51 · answer #2 · answered by teachr 5 · 0⤊ 0⤋
no ELEMENTS are man made since they are the smallest unit possible and cannot be broken down into simpler substances. In order for something to me MADE, many things have to be put together to make a new thing. Marie Curie might have DISCOVERED those elements but she did not CREATE or MAKE them.
2006-11-04 09:21:39 · answer #3 · answered by benatmur 2 · 0⤊ 0⤋
Some are man made.
Marie Curie invented Radium and Polonium if im not wrong.
2006-11-04 08:41:41 · answer #4 · answered by luv_phy 3 · 0⤊ 0⤋
most of them occur naturally, some have been prepared in labortories and so are so reactive that in their pure state they cannot exist in nature
2006-11-04 12:36:41 · answer #5 · answered by Anonymous · 0⤊ 0⤋
every element beyond Uranium is manmade.
2006-11-04 10:06:32 · answer #6 · answered by MrZ 6 · 0⤊ 1⤋