Fill in the Blank

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There are ______ groups and ______ periods in the modern form of periodic table.

Fill in the Blanks

There are 18 groups and 7 periods in the modern form of periodic table.

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Chapter 1: Periodic Properties and Variations of Properties: Physical and Chemical - Exercises [Page 17]

Chapter 1 Periodic Properties and Variations of Properties: Physical and Chemical
Exercises | Q 3. (a) | Page 17