Problem: Write the correct chemical formula for the compounds formed from each pair of ions.a. K+, S2−b. Ca2+, O2−c. Na+, O2−d. Al3+, N3−

FREE Expert Solution

Elements gain and lose electrons so that they have the same number of electrons as the noble gases.


• Metals  lose electrons and gain positive (+) charge to become more like their closest noble gas

• Nonmetals  gain electrons and have negative (-) charge to become more like their closest noble gas.


Group 1A            metals                        Lose 1 e-                   +1 charge


Group 2A            metals                        Lose 2 e-                   +2 charge


Group 3A            metals                        Lose 3 e-                   +3 charge


Group 4A            nonmetals                  typically do not gain or lose e- until Tin (Sn) and Lead (Pb)


Group 5A            nonmetals                  Gain 3 e-                    -3 charge


Group 6A            nonmetals                  Gain 2 e-                    -2 charge


Group 7A             nonmetals                  Gain 1 e-                    -1 charge


Group 8A            Noble Gases             Complete Electrons


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Problem Details

Write the correct chemical formula for the compounds formed from each pair of ions.
a. K+, S2

b. Ca2+, O2−

c. Na+, O2−

d. Al3+, N3−

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