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Q.

The period number of long form of periodic table represents

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a

Number of valency electrons

b

Penultimate shell number

c

Antepenultimate shell number 

d

outermost orbit number

answer is B.

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Detailed Solution

In the modern periodic table the period number always represents the outer most orbit number. For example sodium belongs to 3rd period and its outer most obit is 3 

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The period number of long form of periodic table represents