If Z = 3, what would be the valency of the element? Also, name the element.

Let the percentage of (_8^16)X be AThen the percentage of (_8^18)X = 100 €“ A
Then we have (16*A)/100 + ((100-A)*18)/100 = 16.2
Or, 1800 €“ 1620 = 18A €“ 16
A=90
(_8^16)X is 90% and is (_8^18)X 10%.

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