Chemical Elements and Symbols

Chemical element is the set of all atoms with the same atomic number (Z). The atomic number (Z) identifies the element. This proposal was made by Moseleyin 1914.

Each chemical element is represented by a symbol. In general, the symbol of the element should be the initial letter of its name, in block capitals.

H - hydrogen
F - fluorine
O - oxygen
I - iodine
C - carbon
N - nitrogen
B - boron

Others are followed by the second letter of the element.

Co - cobalt
Cr - chromium
Cu - copper
Cs - Cesium
Ca - Calcium
Cd - cadmium

Others have their symbol derived from their Latin name.

At (natrium) - sodium
K (Kalium) - Potassium
S (sulfur) - sulfur
P (phosphoros) - phosphorus
Ag (argentum) - Silver
Au (aurum) - Gold
Cu (cuprum) - copper
Sn (stannum) - Tin
Pb (lead) - lead
Hg (hydrargyrium) - Mercury

The symbol represents the atom of the chemical element. The representation (notation) is made by placing the element symbol, the atomic number Z to the left and below the symbol, and the mass number (A) to the left or right above the symbol. See the model:

Take a look at the examples: