Which of the following inert gases have 2 electrons in the outermost shell?
A
Ne
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B
He
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C
Ar
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D
Kr
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Solution
The correct option is B He Helium (He) is the inert gas that has 2 electrons in the outermost shell. Neon (Ne), Argon (Ar), and Krypton (Kr) are also inert gases but they have 8 electron in their outermost shell.