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If the symbolic representation of an atom is 3X6, find its valency, name and also give the reason for the valency? 

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3X6 => Here subscript 3 represents its atomic number and superscript 6 denotes its mass number. 

Atomic number of element X = 3 

Electronic configuration 2, 1. 

Element X has single electron in outermost shell so its valency would be 1. 

Element X is lithium.

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