Chemistry 8.5 Review

Electronegativity is...

• how good an atom is at attracting electrons
• the ability of an atom to lose electrons
• the energy required to remove an electron from a specific atom
• the charge an ion takes on

As you look from left to right across a period, electronegativity tends to (a)   .

As you go from top to bottom in a group, electronegativity tends to ​ (b)   .

• increase
• decrease

Generally speaking, ​ (a)   tend to have low electronegativity and ​ (b)   tend to have high electronegativity.

• metals
• nonmetals

The polarity of a bond is determined by...

• The sum of the electronegativities of the two atoms

• The difference in the electronegativities of the two atoms

• The charges of the atoms

• None of the Above

Match the bond character to the difference in electronegativity that it matches.

• Nonpolar covalent

• Greater than 1.7

• Ionic

• Less than 0.4

• Polar covalent

• 0.4 - 1.7

Using the electronegativity values in the periodic table, determine whether each bond would be ionic, polar covalent, or nonpolar covalent.

• Br-Cl bond

• Polar Covalent

• Mg-O Bond

• Ionic

• H-O Bond

• Nonpolar Covalent

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What things must be true for a molecule to be polar?

• There is at least one polar bond.

• The molecule is asymmetrical.

• There are at least two different elements bonded to the central atom.

• There are lone pairs on the central atom.