If you think to the chemical symbol S (capital letter) - this is for sulfur.
.7H2O in a chemical formula has the name heptahydrate.
"S" is the the chemical symbol for the element Sulphur.
The scientific name for sulfur is sulfur, with the chemical symbol S.
The chemical formula of the ionic compound formed from cadmium (Cd) and sulfur (S) is CdS, and its name is cadmium sulfide.
Since brimstone is another name for sulfur it is an element with the symbol S.
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S is the chemical formula for Sulfur.
The name of the chemical element is derived from the name of the well known, Nobel prize laureate - the physicist Niels Bohr.
The ionic compound formed by sodium (Na) and sulfur (S) is sodium sulfide with the chemical formula Na2S.
S is the chemical symbol of sulfur.
The chemical symbol for sulfur is S
The chemical symbol for sulfur (sulphur) is S, and it has the atomic number 16. The curious person would find out more here: http://en.wikipedia.org/wiki/Sulfur