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Derrick253
11.07.2019 •
Chemistry
What is the relationship between electronegativity and bond type? put another way, how could you predict whether a compound would be ionic or covalent if given a list of the elements’ electronegativities?
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Ответ:
The greater the difference in electronegativity (ΔEN) between two atoms, the greater the degree in ionic character in the bond.
If you have a bond between atoms A and B (A-B),
ΔEN = |EN_A - EN_B|
The rules for the type of bond are:
•If ΔEN < 0.5, the bond is nonpolar covalent
•If 0.5 ≤ΔEN < 1.7, the bond is polar covalent
•If ΔEN ≥ 1.7, the bond is ionic
Examples:
C-H: ΔEN = |2.55 – 2.20| = 0.35; nonpolar covalent
C-F: ΔEN = |2.55 – 3.98| = 1.43; polar covalent
Na-F: ΔEN = |0.93 – 3.98| = 3.05; ionic
Ответ:
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