NO2^-, the nitrite anion, is made with covalent bonds between N and O. It is polar. When combined with a metal atom, it forms an ionic bond, such as in NaNO2.
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The increasing order of electronegativity in bonds is lowest for nonpolar covalent bonds, followed by polar covalent bonds, and highest for ionic bonds. In nonpolar covalent bonds, the electronegativity difference between atoms is minimal, whereas in polar covalent bonds, there is a moderate electronegativity difference leading to partial charges. Ionic bonds have the highest electronegativity difference, resulting in complete transfer of electrons.
Polar covalent. The difference in electronegtivity is insufficient for an ionic bond
The bond formed between Si and C is predominantly covalent. Silicon and carbon have similar electronegativities, so they share electrons fairly equally, resulting in a nonpolar covalent bond.
BF3 has a nonpolar covalent bond because the electronegativity difference between boron and fluorine is not significant enough to create a polar covalent bond. In a nonpolar covalent bond, electrons are shared equally between the atoms involved.
If two covalently bonded atoms are identical, the bond is identified as a nonpolar covalent bond.