Molecules and Bonding Unit Practice

The electrons in a polar covalent molecule are shared...

• Evenly

• Unevenly

• Electrons are not shared

• None of the Above

In a polar covalent bond, the electrons gather around...

• The atom with the Greatest Electronegativity

• The atom with the Lowest Electronegativity

• Each atom Equally

• None of the Above

A diatomic molecule like O₂ is always _____ because electrons are shared _____

• nonpolar; unequally

• polar; equally

• nonpolar; equally

• polar; unequally

When you have H-Cl, what is the polarity?

• nonpolar

• polar

• ionic

How many lone pairs of electrons are on the P atom in PF₃?

• 1

• 2

• 3

• 0

How many electrons are shared between the atoms in a molecule of oxygen gas, O₂ ?

• none

• two

• four

• six

According to the octet rule most elements need _______ valence electrons.

• 2
• 8
• 6
• 18

Hydrogen needs _____ electrons in its valence shell to be stable.

• 4
• 6
• 8
• 2

How strongly an atom attracts electrons is called....................

• Ionization energy
• Electronegativity
• Electricity
• Nuclear force

How many valence electrons does oxygen (atomic #8) have?

• 5

• 6

• 7

• 8