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प्रश्न
How many groups and periods are there in the modern periodic table?
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उत्तर
There are 18 groups and 7 periods in the modern periodic table.
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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
How many groups and periods are there in the modern periodic table?
There are 18 groups and 7 periods in the modern periodic table.