Electronegativity and Ionic Compounds

The video explores whether cesium fluoride (CsF) is ionic or covalent. By examining the periodic table, cesium is identified as a metal and fluorine as a non-metal, suggesting an ionic bond. The electronegativity difference between cesium (0.79) and fluorine (3.98) is calculated to be 3.19, which is well above the threshold for ionic bonds. Therefore, CsF is confirmed to be an ionic compound.

What type of elements are involved in forming cesium fluoride?

• Two non-metals

• A metalloid and a non-metal

• A metal and a non-metal

• Two metals

What is the electronegativity value of cesium?

• 3.98

• 0.79

• 2.0

• 1.7

How do you calculate the difference in electronegativity between two elements?

• Multiply their electronegativity values

• Subtract the smaller value from the larger one

• Divide the larger value by the smaller one

• Add their electronegativity values

What is the electronegativity difference between cesium and fluorine?

• 1.7

• 2.0

• 3.19

• 0.79

According to the scale used, what electronegativity difference indicates an ionic bond?

• Above 2.0

• Below 1.7

• Exactly 1.7

• Above 1.7

What type of compound is cesium fluoride?

• Polar covalent

• Ionic

• Covalent

• Metallic