Question

9. An element A forms an oxide A205.
(a) What is the valency of element A ?​

Answer 1

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An element A forms an oxide A205.(a) What is the valency of element A ?

• Element A forms an oxide A2O5.
• Crossing the valencies, we can see that the valency of O (oxide) is −2 and that of element A is 5.

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