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  4. The correct order of decreasing electronegativity values among the elements I-beryllium, II-oxygen, III-nitrogen and IV-magnesium, is

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Q. The correct order of decreasing electronegativity values among the elements $I-beryllium, II-oxygen, III-nitrogen$ and $IV-magnesium$, is

KEAMKEAM 2011Classification of Elements and Periodicity in Properties

Solution:

Electronegativity increases along a period and decreases in a group.
Thus, the order is $(II) > (III) > (I) > (IV)$. Electronegativity of $0 - 3. 5, N -3.0, Be - 1. 5, Mg - 1.2$ .