Polar and Noncovalent Bonding

A covalent bond is formed when two atoms

• share an electron with each other.

• share one or more pairs of electrons with each other.

• gain electrons.

• gain and lose electrons.

A polar covalent bond

• Has equal attraction of the electron pair between the bonded atoms

• Has unequal attraction of the electron pair between the bonded atoms

Use the table below to choose the pair of elements that will most likely have the least ionic character.

Element = Na

Electronegativity = 0.9

Element = O

Electronegativity = 3.5

Element = Cl

Electronegativity = 3.0

Element = H

Electronegativity = 2.1

• Na and Cl

• O and Cl

• H and O

• Na and O

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the dipole charge on the chlorine atom in the molecule HCl?

• +1

• -1

• δ+

• δ-

Tags

NGSS.HS-PS2-4

Atoms that are bonded with an electronegativity difference of 0 to 0.3 are generally considered to be

• negatively charged compounds.

• non-polar-covalent compounds.

• polar-covalent compounds.

• ionic compounds.

Tags

NGSS.HS-PS1-1

K = 0.2

Br = 2.8

N = 3.0

S = 2.5

choose the pair of elements that will most likely have the greatest ionic character.

• K and N

• K and S

• N and Br

• S and Br

Tags

NGSS.HS-PS1-3

1. Which of the following molecules is the most polar?

• H − Cl

• H − Br

• H − I

• H − F

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

2. Which of the following molecules is the least polar?

• H − N

• H − Si

• H − O

• H − C

Which of the following compounds is the most ionic?

• KF

• HF

• LiF4

• CF4

Which of the following compounds is the most ionic?

• KF

• HF

• LiF4

• CF4