A chemical symbol is a notation of one or two letters representing a chemical element.
A chemical symbol is the shortform of the name of an element. Usually, it is made up of one or two letters, but sometimes it is made up of three letters. The chemical symbols of all elements are listed in the periodic table. They are also used while writing chemical equations. For example: C + O 2 → CO 2. Here C stands for carbon and O stands for oxygen. For example, H is the chemical symbol of hydrogen. Some other chemical symbols are the short forms of their Latin names. For example, Na is the chemical symbol of sodium which is called 'Natrium' in Latin. There are also symbols in chemical equations for groups of chemical elements, for example in comparative formulas. These are often a single capital letter, and the letters are reserved and not used for names of specific elements. A chemical element or element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei (i.e. the same atomic number, Z). List of chemical symbols. Most chemical elements are represented symbolically by two letters, generally the first two in their name. In some cases, the first letter together with some other letter from their name was used, particularly when their first two letters had already been allocated to another element.  Noun. 1. chemical formula-a representation of a substance using symbols for its constituent elements. formula. statement-a message that is stated or declared; a communication (oral or written) setting forth particulars or facts etc; according to his statement he was in London on that day. 91.22. letter or the first and one of the subsequent letters of the Latin name of the elements. In chemical formulas and chemical equations each chemical symbol expresses the relative weight (the atomic weight) in addition to the name of the element.  7. Iron-Fe (from the Latin word ferrum). All of the 118 elements on the periodic table have chemical symbols represented by the first letter or two of the name of the element. If the chemical symbol has two letters the first letter is always capitalized and the second letter is written in lower case. For chemical symbols that consist of one letter, that letter is always capitalized. For example, C represents carbon, Ca for calcium, O for oxygen. In this lesson, you will learn that a chemical symbol is a short-hand way to represent an element and each element on the periodic table has a unique chemical symbol. You'll become familiar with identifying some common elements by their chemical symbol. A chemical symbol is a short-hand method of representing an element. Instead of writing out the name of an element, we represent an element name with one or two letters. As you know, the periodic table is a chemist's easy reference guide. In this lesson, you will learn that a chemical symbol is a short-hand way to represent an element and each element on the periodic table has a unique chemical symbol. You'll become familiar with identifying some common elements by their chemical symbol. In chemistry, a symbol is a code for a chemical element. It is usually derived from the name of the element, often in Latin. This is an example of an atomic symbol. The text boxes explain where the numbers are derived from. For example, He is the symbol for helium (English name, not known in ancient Roman times), Pb for lead (plumbum in Latin), W for tungsten (wolfram in German, not known in Roman times). Only the first letter is capitalized. Chemical Symbol Definition: A chemical symbol is a notation of one or two letters representing a chemical element. 
https://simple.wikipedia.org/wiki/Atomic_symbol https://en.wikipedia.org/wiki/Chemical_element http://www.bodycote.com/en/site-services/list-of-chemical-symbols.aspx http://www.thefreedictionary.com/chemical+formula http://encyclopedia2.thefreedictionary.com/Chemical+symbols http://study.com/academy/lesson/chemical-symbol-definition-examples.html http://study.com/academy/lesson/chemical-symbol-definition-examples.html https://en.wikipedia.org/wiki/Symbol_%28chemistry%29 http://chemistry.about.com/od/chemistryglossary/g/Chemical-Symbol-Symbol.htm
chemical symbol definition