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Q.
Consider the following statements
1. In Modern Periodic Table, the number of periods is 7.
2. In Modern Periodic Table, the number of groups is 18.
3. The long form of Periodic Table was developed by Range and Werner.
Which of the Correct?
(a)Only 1
(b)1 and 2
(c)2 and 3
(d)1, 2 and 3 Right sign
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