Chemistry
An element 'X' has same number of electrons in its first & in its outermost shell. The electronic configuration of X2+ is :
- 2, 8, 1
- 2, 8
- 2, 8, 2
- 2, 8, 8
Chemical Bonding
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Answer
Both 2,8 and 2,8,8 can be correct.
Reason — The first shell can have a maximum of 2 electrons. Since element X has the same number of electrons in its first shell and in its outermost shell, its outermost shell also contains 2 electrons.
Thus, X may have electronic configuration:
- 2,8,2 — on losing 2 electrons, X2+ becomes 2,8
- 2,8,8,2 — on losing 2 electrons, X2+ becomes 2,8,8
Hence, both 2,8 and 2,8,8 are possible electronic configurations of X2+. Therefore, the question has two correct options unless the atomic number or period of element X is specified.
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