Chemical Symbol | Overview, Examples & Origin
Table of Contents
- What is a Chemical Symbol?
- What Does a Chemical Symbol Represent?
- Chemical Symbol Examples
- Lesson Summary
An element in chemistry is a substance that cannot be broken down into different substances. An element is made up of only one type of atom. An element symbol is a shorthand used to represent an element. A chemical symbol is a letter or pair of letters used to represent a chemical element. Chemical symbols and element symbols are used synonymously. Using a chemical symbol is similar to using an abbreviation; a doctor might write MD after her name to show that she is a doctor of medicine.
The chemical symbol for an element is used when writing the chemical formula for a molecule, or when writing a chemical equation because it is shorter and easier. A subscript may be used along with the symbol to show that more than one atom of that element is involved. O2 for example, refers to two atoms of oxygen bonded together. It is much quicker to write H2 O, for example, than to write a molecule with two atoms of hydrogen and one atom of oxygen. The use of chemical symbols also helps standardize the language of chemistry. When a chemist in one country references the element Al, other scientists worldwide, no matter their native language, know the element they are referring to is aluminum.
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A chemical symbol is a shorthand way of referring to a specific chemical element. If the chemical symbol is one letter, it is capitalized. If it is a two-letter chemical symbol, only the first letter is capitalized.
Often, the chemical symbol is the first or the first two letters of the name of the element. For example, the chemical symbol for oxygen is O, and the chemical symbol for helium is He.
Sometimes, the chemical symbols and meanings are more difficult to understand because they have roots in the Latin language. The chemical symbol for gold, for example, is Au because the Latin word for gold is aurum. The chemical symbol for lead is Pb from the Latin word for lead, plumbus.
Some of the more recently discovered elements were named after a scientist or the place where the element was first identified. The element bohrium, whose chemical symbol is Bh, is named after Danish physicist Niels Bohr, while the element berkelium, for which the chemical symbol is Bk, is named after the University of California-Berkeley.
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Chemical symbols can be found in the periodic table of elements. The periodic table of elements is a table of elements organized in ascending order by atomic number. Atomic number is the number of positively charged protons in the atom's nucleus. The periodic table is a reference tool that all chemists use, and one that can be found online and in any chemistry textbook.
Here are some examples of elements and their corresponding chemical symbols.
- H is the chemical symbol for hydrogen.
- Li is the chemical symbol for lithium.
- B is the chemical symbol for boron.
- C is the chemical symbol for carbon.
- Ar is the chemical symbol for argon.
- Ca is the chemical symbol for calcium.
- Fe is the chemical symbol for iron," from the Latin word for iron, ferrum.
- Sn is the chemical symbol for ''tin'', from the Latin word for tin, stannum.
- Ag is the chemical symbol for ''silver'', from the Latin word for silver, argentum.
- Cm is the chemical symbol for curium, named after Marie and Pierre Curie.
- Es is the chemical symbol for einsteinium, named after Albert Einstein.
- No is the chemical symbol for nobelium, named after Alfred Nobel.
- Po is the chemical symbol for polonium, named after Poland.
- Eu is the chemical symbol for europium, named after Europe.
- Am is the chemical symbol for americium, named after America.
When a new chemical element is discovered, it may be given a temporary three-letter chemical symbol until the discovery has been confirmed. Many scientists, however, will refer to these new elements simply by their atomic number, calling the newly discovered element element 119, for example.
Origin of Chemical Symbols
Chemical symbols were originally literal symbols rather than letters. When chemists, called alchemists long ago, isolated or discovered a particular element, they would name it using a symbol, often a symbol created by the alchemists themselves. What is known as S, the chemical symbol for sulfur, was originally represented using the following symbol.
What is known as Au, the chemical symbol for gold, was originally represented using the following symbol.
Swedish scientist Jons Jacob Berzelius, in the early 19th century, is credited with developing the system of chemical symbols in use today. He was not the first person to use the first letter or letters of an element as its symbol, but he was the first to standardize their use for all elements known at that time.
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An element is a substance that cannot be broken down into different substances. An element is made up of only one type of atom. A chemical symbol, also called an element symbol, is a letter or pair of letters used to represent a chemical element. The chemical symbol for an element is used when writing the chemical formula for a molecule, or when writing a chemical equation because it is shorter and easier. If the chemical symbol is one letter, it is capitalized. If it is a two-letter chemical symbol, only the first letter is capitalized.
Chemical symbols can be found in the periodic table of elements. The periodic table of elements is a table of elements organized in ascending order by atomic number. Atomic number is the number of positively charged protons in the atom's nucleus. When a new chemical element is discovered, it may be given a temporary three-letter chemical symbol until the discovery has been confirmed. Many scientists, however, will refer to these new elements simply by their atomic number.
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Video Transcript
What is a Chemical Symbol?
Think of all the symbols and shorthand ways we represent things in our daily lives. A common example of a symbol that you use every day is an emoticon on your cell phone. You use a smiley face to indicate that you are pleased about something. You don't text 'I'm pleased about that'; instead, you just insert a smiley face. You may also use a shorthand version of your name, a nickname, like Bill instead of using the longer version of your name, William.
Chemical symbols are used in much the same way. A chemical symbol is a shorthand 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. As shown below, the periodic table contains the elements arranged by size of the atom that makes up the element and the properties of those atoms. Each element is represented by a chemical symbol consisting of letters. Examples of chemical symbols are shown in the next section.
Origin of Chemical Symbols
So what are the origins of these chemical symbols? As early chemists (known as alchemists back then) discovered the fascinating world of chemistry, they often symbolized their newly discovered elements by weird icons, like the one shown here.
Compare these weird symbols to the ones used for these elements today:
1. Tin- Sn (from the Latin word, stannum)
2. Lead- Pb (from the Latin word, plumbus)
3. Gold- Au (from the Latin word, aurum)
4. Sulfur- S (from the Latin word, sulfurium)
5. Mercury- Hg (from the Latin word, hydrargyrum meaning 'liquid silver')
6. Silver- Ag (from the Latin word argentum)
7. Iron- Fe (from the Latin word ferrum)
All of these 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 lowercase. For chemical symbols that consist of one letter, that letter is always capitalized. For example, C represents carbon, Ca for calcium, O for oxygen.
Some chemical symbols don't seem to make sense because the symbol doesn't correspond with the English word for the element. For example, the element gold is not 'G' or 'Go'. The chemical symbol for gold is Au. You are probably wondering why.
Many of the chemical symbols are derived from the Latin names of elements because Latin was once used as the international language of science. The Latin word for gold is aurum and that's where the chemical symbol for gold was derived.
After element number 56, you can see that many of the names of elements come from the name of a scientist or location where they were studied. Some elements are even named after planets. For example, element number 93 has the chemical symbol Np, from the name of the element, neptunium and it was named for the planet Neptune.
Element number 99 has the chemical symbol Es and is named for Albert Einstein. Element number 102 has the chemical symbol No and is named after Alfred Nobel. Because element number 97, was discovered by scientists working at the University of California in Berkeley, California, it has the chemical symbol Bk.
It wasn't until the early 1800s that attempts were made to standardize the way elements were represented. A Swedish scientist, Jöns Jakob Berzelius, is credited with coming up with a standard way to represent the elements, although he wasn't the first scientist to use them. He thought it would be so much easier to use letters instead of weird pictures to represent elements.
Use of Chemical Symbols
As you learned, scientists standardized the short-hand way we represent elements, by their chemical symbol. One of the main reasons this was developed was because using letters was the easiest way to represent the elements.
Another reason that we use chemical symbols is to allow us to write chemical formulas easily. A chemical formula is a representation of a compound or molecule that contains more than one atom. For example, the chemical formula for carbon monoxide is CO. You write the chemical symbol for carbon, followed by O. You can learn more about writing chemical formulas in other lessons if you are interested.
Examples of Chemical Symbols
To start becoming familiar with some common elements and their chemical symbols review the pictures below. They show the chemical symbol, and where the element is located on the periodic table. In your study of chemistry, you shouldn't need to memorize all of the chemical symbols on the periodic table since every good chemist (and student of chemistry) always has his or her copy of a periodic table available.
Lesson Summary
In this lesson you learned that a chemical symbol is a shorthand way to represent an element and that each element on the periodic table has a unique chemical symbol. Chemical symbols are used to standardize the 'language of chemistry' and to identify elements and atoms in a chemical formula easily. Chemical symbols consist of one or two letters, most often derived from the name of the element. Our standard chemical symbols used today have been in use for over two hundred years.
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