Problem: Write the empirical formulas for the compounds named in the previous problem.
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Plan: Write the ions and find the smallest number of each that gives the neutral compound.
Solution: a) magnesium nitride Mg 2+ and N 3ñ ; three Mg2+ ions (6+) balance two N 3ñ ions (6 ñ): Mg 3N2
b) cadmium iodide Cd 2+ and Iñ ; one Cd 2+ ion (2+) balances two Iñ ions (2ñ): CdI 2
c) strontium fluoride Sr2+ and Fñ ; one Sr2+ ion (2+) balances two Fñ ions (2ñ): SrF2
d) cesium sulfide Cs+ and S2ñ ; two Cs+ ions (2+) balance one S2ñ ion (2ñ): Cs2S
Skill 5 cont'd. Naming and writing the formula of an ionic compound formed from the ions in Tables 2.3 to 2.5
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