An element X forms a chloride with the formula XCl3 and an oxide with the formula X2O3. Based on this, what is the valency of element X?
3
Chlorine has a valency of 1 and oxygen has a valency of 2. In the chloride XCl3, one X atom combines with three chlorine atoms, so the valency of X must be 3 × 1 = 3.
The oxide X2O3 gives the same answer: two X atoms combine with three oxygen atoms, so 2 × (valency of X) = 3 × 2, which again gives valency of X = 3. Both compounds are consistent, so X shows a valency of 3, not 4, 2 or 1.
Hence, the answer is 3.
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