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For compounds is ionic character greater when the two elements are further apart or when they have greater ionic energy. For example, would K and Cl have greater ionic character than Mg and F? And would the same principle apply to polar character?
For covalent bonds, the ionic character is greater when there when the electrons are not equally shared. This happens when the electronegativity of one atom in a covalent bond is different than the other. The greater the difference, the more ionic the character. In the two examples you mentioned, both these compounds would have an electronegativity difference of greater than 2 so they would both be considered ionic bonds. Polar character is when, in a covalent bond, the atoms are not shared equally as the more electronegative atom pulls the electrons closer. This results in a slight positively charged atom and a slightly negatively charged atom. The greater the electronegativity difference, the greater the charges until eventually it surpasses 2 and therefore is an ionic bond.
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