<P> A chemical element is a species of atoms having the same number of protons in their atomic nuclei ( that is , the same atomic number , or Z ) . 118 elements are 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 exclusively radionuclides , which decay over time into other elements . Iron is the most abundant element ( by mass ) making up Earth , while oxygen is the most common element in the Earth 's crust . </P>
<P> A chemical element is a species of atoms having the same number of protons in their atomic nuclei ( that is , the same atomic number , or Z ) . 118 elements are 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 exclusively radionuclides , which decay over time into other elements . Iron is the most abundant element ( by mass ) making up Earth , while oxygen is the most common element in the Earth 's crust . </P>
how many elements are there in the earth
how many elements are there in the earth
94 occur naturally
94 occur naturally