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The metallic and nonmetallic properties of elements can be judged by their …………… 

(A) electron gain enthalpy 

(B) ionization enthalpy 

(C) electronegativity 

(D) valence

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Correct option is: (C) electronegativity

Metals are electropositive elements while non-metals are electronegative elements.

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(C) electronegativity

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