ਰਸਾਇਣਕ ਤੱਤ: ਰੀਵਿਜ਼ਨਾਂ ਵਿਚ ਫ਼ਰਕ

In total, 118 elements have been characterized as of March 2010, and new elements of higher atomic number are "discovered" from time to time, as new synthetic products of artificial [[nuclear reaction]]s. Of the known elements, the first 94 occur naturally on Earth. Of these, oxygen is the most abundant element in the [[Earth's crust]]. Exactly 80 elements have stable [[isotopes]]: namely all elements with atomic numbers 1 to 82, except elements 43 and 61 ([[technetium]] and [[promethium]]).

 

 

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