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Molecules

In which grou...

Question

In which group, all the elements do not have the same number of valence electrons?

A

eighteenth

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B

first

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C

second

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D

seventh

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Solution

The correct option is A eighteenth
In group number 18, helium contains two electrons in the valence shell, and the other elements, neon to radon, contain eight electrons in the valence shell.

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