write symbols for different elements
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Each element is given its own chemical symbol, like H for hydrogen or O for oxygen. Chemical symbols are usually one or two letters long. Every chemical symbol starts with a capital letter, with the second letter written in lower case. For example, Mg is the correct symbol for magnesium, but mg, mG and MG are wrong.
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The Elements, sorted by Atomic Number
Atomic Number Symbol Name
17. Cl Chlorine
18 Ar. Argon
19 K. Potassium
20 Ca. Calcium
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