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It is the study of the materials that make up our bodies and everything in the world around us.
Element in chemistry definition and examples. A chemical element is a substance that cannot be further broken down by any chemical reaction. Examples of chemical properties include flammability toxicity chemical stability and heat of combustion. Chemistry is a branch of science that explores compounds and chemical elements and how they work together. Elements elements constitute the simplest chemical substances in which all the atoms are exactly the same.
For example an iron atom and a bar of iron are both elements of the chemical element. A chemical property is a characteristic of a substance that may be observed when it participates in a chemical reaction. Chemical reactions abound in the geology of earth in the atmosphere and oceans. The number of protons in the nucleus is the defining property of an element and is referred to as the atomic number represented by the symbol z.
For example one of the best known compounds is water written chemically as h 2 0 which means that water is made of two atoms of hydrogen chemically bonded to one of oxygen. In chemistry an element is a pure substance which cannot be broken down by chemical means consisting of atoms which have identical numbers of protons in their atomic nuclei. Examples of compounds include table salt or sodium chloride nacl an ionic compound sucrose a molecule nitrogen gas n 2 a covalent molecule a sample of copper intermetallic and water h 2 o a covalent molecule. Each element has a unique number of protons in its atom.
For example a hydrogen atom has 1 proton while a carbon atom has 6 protons. Chemical reactions are an integral part of technology of culture and indeed of life itself burning fuels smelting iron making glass and pottery brewing beer and making wine and cheese are among many examples of activities incorporating chemical reactions that have been known and used for thousands of years. Varying the number of electrons in an atom of an element produces ions.
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