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What is the Number of Elements is : (A) 1st Period, and (B) 3rd Period, the Modern Periodic Table? - Science

What is the number of elements is 1st period the modern periodic table?

The number of elements in 1st period is 2 in the modern periodic table.

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Chapter 5: Periodic Classification Of Elements - Exercise 2 [Page 304]

Chapter 5 Periodic Classification Of Elements
Exercise 2 | Q 29.2 | Page 304

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