Nonpolar covalent bonds defined

Covalent bonds may be either polar or nonpolar. In a nonpolar bond such as that in the hydrogen molecule, H2, (H H or H—H) the electron pair is shared equally between the two hydrogen nuclei. We defined electronegativity as the tendency of an atom to attract electrons to itself in a chemical bond (see Section 6-6). Both H atoms have the same electronegativity. This means that the shared electrons are equally attracted to both hydrogen nuclei and therefore spend equal amounts of time near each nucleus. In this nonpolar covalent bond, the electron density is s)mimetrical about a plane that is perpendicular to a line between the two nuclei. This is true for all homonuclear diatomic molecules, such as H2, O2, N2, F2, and CI2, because the two identical atoms have identical electronegativities. We can generalize ... 

Is the H—O bond in water nonpolar covalent, polar covalent, or ionic Define each term, and explain your choice. 

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