why does some element have two letters for their chemical symbol but others have onlu one
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because that they cannot repeat the same letter in each and every elements so that we should not get confused
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Since the formulas for chemical compounds are written by placing the symbols next to each other (with number subscript sometimes), the capital letter shows that a new element is being referenced. The capital letter serves to separate chemical symbols in the same way that spaces separate words in a sentence.
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