Approximate ranges of electronegativity difference Δχ: < 0.5 → nonpolar covalent; 0.5-1.7 → polar covalent; <blockquote 1.7 → ionic. NaCl (Δχ ≈ 2.1) is </blockquote

Ionic Large electronegativity difference → essentially complete electron transfer → ionic.

Types of Chemical Bonds

AP Chemistry· difficulty 3/5

Approximate ranges of electronegativity difference Δχ: < 0.5 \to nonpolar covalent; 0.5-1.7 \to polar covalent; <blockquote> ~1.7 \to ionic. NaCl (Δχ \approx 2.1) is </blockquote>

Explanation

Large electronegativity difference \to essentially complete electron transfer \to ionic.

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