How Many Types Of The Biological Elements Are Used In All Living Organisms?


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All matter, both living and no living is composed of certain basic substance called elements. It is quite remarkable that there are only 92 naturally occurring elements.
About 16 elements are used in formation of chemical compounds from which living organisms are made. These 16 elements and a few others, which occur in a particular organism, are called bio elements.
In human body only six-bio elements account for 99% of the total mass. These include carbon, hydrogen, nitrogen, oxygen, phosphorus and calcium. The acronym CHNOPCa helps us to remember these six elements.
The facts that the same 16-bio elements occur in all organisms, and their properties differ from those in the non-living world, show that bio elements have special properties, which make them particularly appropriate as a basis for life.
In early 1800s, the English scientist Jhon Dalton proposed that elements actually contain tiny particles called atoms. He also deduced that there is only one type of atom in each type of element. Atom is made up of certain subatomic particles, the most stable of these are protons, neutrons and electrons. Protons and neutrons are located within nucleus of the atom. The electron moves about the nucleus.

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