The Ionic Bond between Li and Br: Understanding Electronegativity Differences

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SUMMARY

The discussion centers on the ionic bond between lithium (Li) and bromine (Br), highlighting their electronegativity values: Li at 1.0 and Br at 2.8. The calculated difference of 1.8 indicates a polar bond, but rounding the values to 1.0 for Li and 3.0 for Br results in a difference of 2.0, confirming the bond's ionic nature. The conversation also touches on the classification of AlCl3 as covalent, prompting further inquiry into the nature of ionic versus covalent bonds.

PREREQUISITES
  • Understanding of electronegativity and its significance in bond formation
  • Knowledge of ionic and covalent bond characteristics
  • Familiarity with periodic table trends, particularly metal and non-metal classifications
  • Basic grasp of rounding principles in scientific calculations
NEXT STEPS
  • Research the concept of electronegativity and its role in predicting bond types
  • Explore the differences between ionic and covalent bonds in detail
  • Learn about the properties of metal and non-metal elements in bonding contexts
  • Investigate the exceptions to typical bonding classifications, such as AlCl3
USEFUL FOR

Chemistry students, educators, and professionals interested in understanding bond types and electronegativity differences in chemical compounds.

Edin_Dzeko
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Li (Electronegativity) = 1.0
Br (Electronegativity) = 2.8

2.8 - 1.0 - 1.8

Ionic = 2.0+
Polar = .4 - 2.0+
Non polar covalent = 0 - 0.4

1.8 doesn't it fall into the polar range? I got that wrong on a h.w. question
 
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We round the electronegativity of lithium to 1.0, and bromide to 3.0, so the difference is actually 2.0.

It is also ionic because it is a bond between a metal and non-metal.
 
student54321 said:
We round the electronegativity of lithium to 1.0, and bromide to 3.0, so the difference is actually 2.0.

This is way too handwavy for my liking. Selectively rounding you can prove anything, including 0=1.

It is also ionic because it is a bond between a metal and non-metal.

So why is AlCl3 covalent?
 

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