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Q.

Select correct graph, which is plotted between ionization energy of 2nd period elements and their atomic number.

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a

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b

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c

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d

 

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answer is A.

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Detailed Solution

Graph A plotted between ionization energy of 2nd period elements and their atomic number is correct

The overall pattern throughout periods 2 and 3. Ionization energies tend to get stronger with time, on average. 

The outer electrons reside in 2-level orbitals, either 2s or 2p, for the entirety of period 2. The identical 1s2 electrons are used to screen all of them at similar distances from the nucleus.

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