Ionic Bonding Test Review FC

How many sulfur atoms in Al₂(SO₄)₃

• 2

• 3

• 1

• 12

Answer explanation

sulfur is inside the parenthesis so multiply subscript inside by subscript outside the parenthesis (1x3=3)

An ionic bond is the attraction between:

• oppositely charged ions

• similarly charged ions

• neutral ions

• neutral atoms

Cations are

• negative ions

• positive ions

• neutral atoms

• neutral ions

Which is written second in an ionic compound chemical formula?

• cation

• anion

• positive ion

• metal

Answer explanation

ionic compound formula is written with the metal (cation) first and the nonmetal (anion) second

Metals

• Lose electrons and become positive ions

• Lose electrons and become negative ions

• Gain electrons and become positive ions

• Gain electrons and become negative ions

Answer explanation

Metals have only 1,2 or 3 valence electrons that they will give away to become more stable. Electrons are negative, so if some are given away the atom will become positive.

In the chemical formula for an ionic compound, which item is written first?

• positive ion

• negative ion

• subscript

• the female

Answer explanation

The cation (which is positive) is always written first. Metals will form cations.

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

• subscript

• oxidation number

• ion charge

• exponent

Answer explanation

The subscript tells how many atoms are directly BEFORE it.

How many valence electrons does Boron have? (it is in group 13)

• 13

• 5

• 3

• 11

Answer explanation

Group 13 has 3 valence electrons. Drop the 1 in front of group numbers above 12 to get the number of valence electrons.

What is the oxidation number for Iodine (I)?

• 1

• -1

• -7

• 17

Answer explanation

Oxidation number is the charge on the ion.

See the trend on the periodic table. It is the number of electrons an atom will gain or lose in a chemical bond.

What is the ion for Nitrogen?

• -3

• N^3-

• N⁵⁺

• N³⁺

Answer explanation

Nitrogen has 5 valence electrons, so it will gain 3 electrons to make 8. Gaining 3 electrons (which are negative) will result in a -3 charge.