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प्रश्न
Define periods of modern periodic table.
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उत्तर
The horizontal rows are called periods. The table consists of 7 periods, numbered from 1 to 7 from top to bottom.
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संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
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Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
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| Period ↓ | ||||||||
| 2 | A | B | ||||||
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