Answer
If the electronegativity difference between two atoms is in the range of 0.0 to 0.4, then it is nonpolar covalent. If the electronegativity difference between two atoms is in the range of 0.4 to 1.0, then it is moderately polar covalent. If the electronegativity difference between two atoms is in the range of 1.0 to 2.0, then it is very polar covalent. If the electronegativity difference between two atoms is greater than 2.0, then it is ionic.
Work Step by Step
If the electronegativity difference between two atoms is in the range of 0.0 to 0.4, then it is nonpolar covalent. If the electronegativity difference between two atoms is in the range of 0.4 to 1.0, then it is moderately polar covalent. If the electronegativity difference between two atoms is in the range of 1.0 to 2.0, then it is very polar covalent. If the electronegativity difference between two atoms is greater than 2.0, then it is ionic.