Chemistry Class 12 Chapter 1 - Periodic Classification of Elements and Periodicity

FILL IN THE BLANKS 1. Periodic classification is based on the _________ and __________ properties of the substance. 2. __________ gave the law of octave. 3. The horizontals rows of the table are called _________. 4. The sub-groups containing the typical or normal elements are called _________ sub-group. 5. The 6th period contain _____________ elements. 6. Due to scarcity the inner transitions elements are also called. 7. The elements of group IA are also called ___________.

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