Ionic Compounds and Valence Electrons Review

What are the properties of ionic compounds?

• Ionic compounds have high melting and boiling points, are ductile, and do not conduct electricity

• Ionic compounds have no melting and boiling points, are malleable, and conduct electricity only when solid

• Ionic compounds have high melting and boiling points, are brittle, and conduct electricity when dissolved in water or melted.

• Ionic compounds have low melting and boiling points, are flexible, and do not conduct electricity

How do you determine the number of valence electrons in an atom?

• The number of valence electrons in an atom can be determined by looking at the group number of the element in the periodic table.

• The number of valence electrons in an atom is determined by the number of neutrons in the nucleus.

• The number of valence electrons in an atom can be determined by counting the number of protons in the nucleus.

• The number of valence electrons in an atom is always equal to the atomic number of the element.

How many valence electrons does sodium (Na) have?

• 5

• 8

• 1

• 2

What is the valence electron configuration of potassium (K)?

• 4s¹

• 2p³

• 5s¹

• 3s²

Nitrogen will form which of the following ions?

• N
• N^-3
• N^-5
• N⁺⁵

Beryllium will ____ valence electrons when forming an ionic bond.

• lose 4
• gain 4
• lose 2
• gain 2

Magnesium bromide is an ionic compound with the chemical formula MgBr₂.  What does the "2" tell you?

• There are 2 bromide ions for every magnesium ion
• Bromide has a 2- charge
• Bromide has a 2+ charge
• There are 2 magnesium ions to every bromide ion

Oxygen has _____ valence electrons.

What is the charge of ion "X" in the formula XF₃?

• +3

• -3

• +1

• -1

In an ionic bond, the ions are held together because...

• the positive nucleus of each ion attracts the other ion's negatively charged electrons

• the ions have opposite charges

• as the electron moved from one atom to another it pulled the atom along with it

• electrons are being shared