What is a chemical element?

A chemical element or element is a species of atoms having the same number of protons in theiratomic nuclei (i.e. the same atomic number, Z). There are 118 elements that have been identified, of which the first 94 occur naturally on Earth with the remaining 24 being synthetic elements. There are 80 elements that have at least one stable isotope and 38 that have exclusivelyradioactive isotopes, which decay over time into […]

 
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