For example, the symbol for sodium (Na) is derived from the latin word, natrium, which means sodium carbonate. These letter codes are derived from latin terminology. Some of the elements have seemingly strange letter codes, such as sodium which is Na. For example, the symbol for Hydrogen is H, and the symbol for carbon is C. 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.
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