CHEM 5.7 Names and Formulas of Ionic Compounds

Question 1

Naming Ionic Compounds

Answer 1

The metal ion remains the same (Magnesium –> Magnesium)

The non-metal finishes in “ide” (Chlorine –> Chloride)

The compound becomes Magnesium Chloride.

Question 2

Be3N2

Answer 2

Beryllium Nitride

Question 3

Calcium Bromide

Answer 3

CaBr2

Question 4

Na2Se

Answer 4

Sodium Selenide

Question 5

Potassium Telluride

Answer 5

K2Te

Question 6

The criss-cross method

Answer 6

1. Write the ionic charge (valence) of each element, above and to the right, for each element.
2. Criss-cross the numbers down to become subscripts on the opposite element.
3. Cancel to the lowest ratio by dividing by the largest common factor.

Question 7

Elements with Multiple Ionic Charges

Answer 7

When naming these compounds, you must look at the periodic table to see which options are available and then work backwards from your cross-over method and make sure to include the roman numerals in brackets.

CuBr2 –> Copper can have a charge of +1 or +2 –> Copper (|) Bromide