Define symbol..
Define valency..
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a mark or character used as a conventional representation of an object, function, or process, e.g. the letter or letters standing for a chemical element or a character in musical notation.
the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with...
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Symbol - a sign , object etc which represent something .
Valency - a measurement of the power of an atom to combine with others , by the number of hydrogen atoms it can combine with or take the place of
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