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An element with atomic number 20 will be...

An element with atomic number 20 will be placed in which period of the periodic table

A

4

B

3

C

2

D

1

Text Solution

Verified by Experts

The correct Answer is:
A
`1s^2 2s^2 2p^6 3s^2 3p^6 4 s^2` principal quantum no. is 4 so it belongs to 4th period.
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