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Number of Elements in a Period

The period of...

Question

The period of element with atomic number 20 in the periodic table is :

A

1

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B

2

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C

3

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D

4

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Solution

The correct option is D 4
Atomic number with 20: (electronic configuration) 2, 8, 8, 2. The total number of shells are four, therefore it will belong to the fourth period.

Hence the correct option is D.

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