According to Cambridge Dictionaries Online (2009), an element is a simple substance which cannot be reduced to smaller chemical parts, for an example; hydrogen is an element. Element is a pure substance which cannot be broken down into two or more simpler substances by any chemical or physical method. In other words, we can say it as the simplest form of matter. An element is made up of only one type of particle. The most abundant element on earth is in the air that we breathe and that is oxygen. Different types of elements are made up of different atoms. There are so many definition or explanation of the element that we would found on our literature, some are described an element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing a single proton and a single electron. If you change the number of protons an atom has, you change the type of element it is (http://education.jlab.org/qa/element.html).
Compounds are a chemical that combines two or more elements, such as salt, sugar and water. Which is, salt is compound of sodium and chlorine, and water is compound of hydrogen and oxygen (H2O), each element is Hydrogen and oxygen. A compound is a substance consisting of atoms or ions of two or more elements that are chemically bonded together, e.g. carbon dioxide, a substance consisting of carbon and two oxygen atoms (Biology Online, 2009). It also known as substance that formed by chemical union of two or more elements or ingredients in definite proportion by weight
(http://www.wordreference.com/definition/compound).
A mixture is a substance consisting of two or more substances mixed together (not in fixed proportions and not with chemical bonding) (http://www.wordreference.com/definition/compound). A mixture also is a substance consisting of two or more substances mixed together. For an example, an alloy made from the mixture of two metals.
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