Answer :
Isotopes - Common elements of the living organisms are Nitrogen, oxygen, phosphorus, sulphur and carbon. These are the 6 most knowing common elements. It's included more then 95% to 97% mass on a human body.
What is isotopes?
Isotopes are two or more different atom types that share the very same atomic number as well as position in the periodic table but have different numbers of neutrons in their nuclei, resulting in different nucleon numbers. Although the chemical properties of each isotope of a given element are nearly identical, they differ in their atomic masses as well as physical characteristics. The word "isotope" is derived from the Greek words "isos" and "topos," both of which mean "the same place." As a result, the name refers to the fact that various isotopes of a given element occupy the very same spot on the periodic table. In 1913, Scottish physician and author Margaret Todd suggested the term to British chemist Frederick Soddy.
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