2007-02-07 03:43:47 · 3 answers · asked by perfect_imperfection 2 in Science & Mathematics ➔ Chemistry
It's a tricky question! What do you mean by "exist in nature"? If you mean those elements existing by themselves without the human intervention, they are 90 (all, up to U and excluding Technetium and another one I don't remember which, because these two are artificial). On the contrary, if you mean really "all", then they are around that other figure - my textbook says even 109. Actually, once they are manufactured, they belong to nature too!
2007-02-07 05:09:47 · answer #1 · answered by Len M 3 · 0⤊ 0⤋
It's 112. the portion of the periodic tabel that is detached because these atoms were created in a closed environment, and will immediatlly go through atomic decay if exposed to the environment on this planet. you could say they are test tube atoms,.
2007-02-07 12:54:04 · answer #2 · answered by Falcon Man 3 · 0⤊ 0⤋
about 107 elements
2007-02-07 11:46:51 · answer #3 · answered by Mohsen J 2 · 0⤊ 0⤋