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Elements in the same period have the same principal quantum number. Na (3s¹) and Al (3p¹) are in period 3, unlike the other pairs spanning different periods.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table
In period 2, the largest electronegativity difference is between Li (1.0) and F (4.0), a gap of 3.0, compared to other pairs like Be-B or C-N.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electron Gain Enthalpy and Electronegativity and Valency
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