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Number of Elements in a Period

The element w...

Question

The element with the atomic number $9$ resembles with the element having the atomic number:

A

8

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B

17

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C

36

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D

27

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Solution

The correct option is B $17$
Atomic number 9 has electronic configuration=2,7
Atomic number 17 has an electronic configuration=2,8,7.
So, both the elements belong to the same group i.e. halogens and have similar properties as they have the same number of valence electrons.

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