आधुनिक आवर्त सारणी में कित – McqOptions

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1.	आधुनिक आवर्त सारणी में कितने अर्ध्ब स्तम्ब है जिन्हेसमूहकहा जाता है ?
A.	10
B.	15
C.	18
D.	20
Answer» D. 20

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