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Periods

The elements ...

Question

The elements with atomic numbers $2, 10, 18, 36, 54$ and $86$ are all______.

A

Light metals

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B

Halogens

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C

Rare earths

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D

Noble gases

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Solution

The correct option is D Noble gases
Noble gases have stable configuration in their outermost shell.
2=2
10=2,8
18=2,8,8
36=2,8,8,18
54=2,8,8,18,18

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