Covalent Bond Chemistry question ??? need help!!?

which of the following statements correctly describes the difference between a polar covalent bond and a nonpolar covalent bond... - a polar covalent bond occurs when atoms share electron pair but one electron is left unpaired. a nonpolar covalent bond occurs when all the electrons are shared - a polar covalent... show more which of the following statements correctly describes the difference between a polar covalent bond and a nonpolar covalent bond...

- a polar covalent bond occurs when atoms share electron pair but one electron is left unpaired. a nonpolar covalent bond occurs when all the electrons are shared
- a polar covalent bond occurs from unequal sharing of electrons, whereas a nonpolar covalent bond occurs during equal sharing events
- a polar covalent bond occurs between ions, whereas a nonpolar covalent bond occurs between atoms
- a polar covalent bond occurs when an electron is transferred between two atoms, whereas a nonpolar bond occurs with the transfer of a proton
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