chapter 8 35-50

How many single covalent bonds must a chlorine atom form to have a complete octet in its valence shell?

• 0

• 1

• 2

• 3

• 4

The most electronegative atom of the ones listed below is ________.

• B

• Al

• Ga

• In

• Tl

Of the atoms below, ________ is the least electronegative.

• B

• F

• C

• N

• O

Of the bonds below, ________ is the least polar.

• C-O

• N-O

• C-F

• S-O

• K-Br

The oxidation number of phosphorus in PF5 is ________.

• +5

• +3

• +1

• -5

• 0

The central atom in ________ violates the octet rule.

• PF5

• SF2

• Cl2

• Br2CO

• FCN

If more than one Lewis structure can be drawn then the molecule or ion is said to have ________ forms.

If the bonds in the reactants of a reaction are weaker than the bonds in the product, the reaction is ________.

A positive change in bond enthalpy is required to break a bond.

• true

• false

In some molecules and polyatomic ions, the sum of the valence electrons is odd and as a result the octet rule fails.

• true

• false