Four of the 92 naturally occurring elements—carbon, hydrogen, nitrogen, and oxygen—compose around 96% of the mass of the human body.
A substance that cannot be converted into another substance is known as an element. Each of the approximately 100 elements has a unique form of atom. Atoms from at least one or more elements are present in everything in the cosmos. All known elements are listed in the periodic table, with those with related properties being grouped together.
The metals and non-metals are the other two basic categories into which the elements can be separated. It is common for metals to be shiny, malleable (able to bend), and electrically conductible. These characteristics are often absent from nonmetals.
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