Which statement accurately describes the chemical symbol of an element?

The chemical symbol always begins with a capital letter.

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... The chemical symbol is always a single letter.
... The chemical symbol always starts with the same letter as the name of the element.
No for both choices. 
Examples:  The chemical Symbol for silver is Ag.  For lead, it's Pb.

... The chemical symbol always begins with a capital letter.
YES

... The chemical symbol can be shared by more than one element. 
No.  Each chemical symbol refers to only one element.

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