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Question
Fill in the blank:
The modern periodic table consists of ……………. periods.
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Solution
The modern periodic table consists of 7 periods.
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| Period ↓ | ||||||||
| 2 | A | B | ||||||
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| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
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