Question

multivalent ionic compounds
goal - to write names and formulas of multivalent ionic compounds.
naming ionic compounds containing multivalent metals
ions that have more than one charge are multivalent. when we name compounds that contain multivalent metal ions we use roman numerals to indicate which charge is involved. read through the steps in the chart below, then examine the example. complete the chart to practice naming compounds with multivalent ions.

1. identify the metal.

copper, cu

1. verify that the metal can form more than one kind of ion by checking the periodic table.

cu+ and cu2+

1. determine the ratio of the ions in the formula.

3 copper : 1 nitrogen

1. note the charge of the negative ion.

3-

1. the positive and negative charges must balance out. determine what charge the metal ion must have to balance the negative ion.

• total: 3-

+ total: 3+

1. write the name of the metal ion.

copper(i)
write the name of the compound. begin with the name of the metal and its ionic charge in roman numerals, then name the non - metal and change its ending to -ide.
copper(i) nitride

Explanation:

Step1: Identify metal for gold(I) and sulfur

The metal is gold.

Step2: Verify ion - forming ability

Gold can form $Au^+$ (gold(I)) and other ions.

Step3: Determine ion ratio

Sulfur forms $S^{2 - }$. For charge balance, we need 2 gold(I) ions for 1 sulfur ion (2:1 ratio).

Step4: Note negative ion charge

The charge of the sulfur ion is 2−.

Step5: Balance charges

Total negative charge from sulfur is 2−. Each gold(I) has a charge of 1+, so 2 gold(I) ions give a total positive charge of 2+ to balance.

Step6: Write metal ion name

The metal ion name is gold(I).

Step7: Write compound name

The name of the compound is gold(I) sulfide.

Answer:

gold(I) sulfide