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Noble Gases

Xenon is trea...

Question

Xenon is treated as noble gas but when you see its electronic configuration ,you will come to know that it's outermost shell have four electrons instead of eight electrons. This same happens with krypton also. I want to know why?

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Solution

Outer shell configuration of Xenon is [Kr] 4d¹⁰5s²5p⁶It has 2+6 = 8 electrons in outer shell so its complete.
Outer shell configuration of Krypton is [Ar] 3d¹⁰4s²4p⁶It has 2+6 = 8 electrons in outer shell so its complete.

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