Each element is represented by a one or two letter code, where the first letter is always capitalized and, if a second letter is present, it is written in lowercase. Today, chemistry recognizes a total of 118 elements which are all represented on a standard chart of the elements, called the Periodic Table of Elements. Using technology, scientists have been able to create nearly 30 additional elements that are not readily found in nature. There are about 90 naturally occurring elements known on Earth. Atoms of different elements differ in mass and other propertiesĢ.2 Introduction to Elements and the Periodic TableĪn elementis a substance that cannot be broken down into simpler chemical substances. All atoms of the same element are identical in mass and other properties.During a chemical reaction, atoms are rearranged, but they do not break apart, nor are they created or destroyed Atoms cannot be broken into smaller pieces.
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