3. An element forms an oxide A 0.. (a) What is the valency of the element A? (b) What will be the formula of the chloride of the element?
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Thus, the valency of a chloride of A is 5. (b) The valency of an atom equals the number of electrons in the outer shell if that number is four or less than four. ... Therefore, the formula of chloride of A will be ACl5.
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