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An element forms compounds of formula ACl3, A2O5 and Mg3A2 but does not form ACl5. Which of the following could A be?
Oxide formed by element A = A2O5 (a) Valency is defined as the combining power of an element, specifically as measured by the total number of hydrogen atoms it can easily displace or combine with. Thus, Let the valency of element A be y, then 2y + 5(-2) = 0 So, y = valency of element A = 5 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. Thus, Since, the valency of element A is 5 and valency of chlorine is -1, Therefore, the formula of chloride of A will be ACl5.
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