Correct answer is 2. Show the steps how it is done

Q.
  ​The formula of the compound is A2B5. The number of  electrons in the outermost orbits of A and B respectively are

(1)  ​6 and 3                                     (2)  ​5 and 6
(3)  ​5 and 2                                     (4)  ​2 and 3

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