Chemistry · Periodic Classification
मेंडलीफ की मूल आवर्त-सारणी में कितने वर्ग (Groups) और कितने आवर्त (Periods) थे?
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- 19 वर्ग और 7 आवर्त✓
- 29 वर्ग और 9 आवर्त
- 38 वर्ग और 7 आवर्त
- 47 वर्ग और 9 आवर्त
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9 वर्ग और 7 आवर्त
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