Chemical Bonding (U3)

What would be a rule for ionic compound formulas?

• The metal always comes before the nonmetal.

• The element with a greater charge always comes first.

• The elements are always listed in alphabetical order.

Mg²⁺ & S^2-

Why is the ratio of ions 1 to 1 (MgS)

instead of 2 to 2 (Mg₂S₂)?

• We simplify the subscripts when they are the same number.

• If possible, we always reduce the subscripts for ionic compounds.

• We only simplify when the subscripts are not the same number.

How many protons and electrons does the N^3- ion have?

• 7 protons, 4 electrons

• 10 protons, 7 electrons

• 4 protons, 7 electrons

• 7 protons, 10 electrons

Sr²⁺ & Cl^1-

What is the formula for strontium chloride?

• Sr₁Cl₂

• Sr₂Cl₁

• Sr^-1, Cl²⁺

• Sr₁Cl₁

Al₂O₃. There are 3 oxide anions and each ion has a 2- charge. There is a total 6- charge.

What is the total positive charge in this compound?

• 11+

• 2+

• 3+

• 6+

What is the overall charge on the compound, sodium fluoride, NaF?

• 1+

• 1-

• 0

• 8

What type of elements do you typically find in metallic crystals?

• metals

• nonmetals

• metal & nonmetal

• noble gases

What type of elements do you typically find in ionic compounds?

• metals

• nonmetals

• metal & nonmetal

• noble gases

What type of elements do you typically find in covalent molecular compounds?

• metals

• nonmetals

• metal & nonmetal

• noble gases

What type of chemical bond is in the compound that strengthens your teeth, sodium fluoride, NaF?

• ionic bond

• covalent bond

• metallic bond