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Distinguishing bonds - ionic or covalent ?

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How do you work out which ionic molecules are more polarised and which are less covalent

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When two different atoms share electron density to form a covalent bond, they generally do not share the electrons of this bond equally. The more electronegative atom will pull the electrons closer to it so that there will be a slight negative charge at this end of the bond (symbolized as -) and a slight positive charge at the other end (symbolized as +). We say that the bond is polarized toward this more electronegative atom, and we sometimes refer to this polar covalent bond as a dipole. Bonds between identical atoms, such as in the homonuclear diatomic molecule H2, will be nonpolar since the atoms are of equal electronegativity, but virtually all other bonds are at least slightly polar. As the electronegativity ...

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