An ion X+2 has 2e- in its valence shell, how many electrons were there-in its valence shell before ionization?
Correct answer: B. 4
- A. 3
- B. 4
- C. 6
- D. 5
Explanation
Ion is formed by either gaining or losing an electron.The positive sign indicates the losing of an electron.The ion X+2 shows that the ion is formed by loosing 2 electrons and as the question states that there are still two electrons present in the valence shell,so the total electrons present before ionization were 2+2=4.
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