Multiple choice

The formula of a compound is A2B5. The number of electrons in the outermost shells of A and B, respectively, are

  1. 5 and 2

  2. 2 and 5

  3. 5 and 6

  4. 2 and 3

  5. -

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A Correct answer
Explanation

The valency in a formula can be explained on the cris-cross basis. Hence, the number of electrons in the outermost shells of A and B would be 5 and 2, respectively.