Final answer:
The Lewis symbols for the most stable ions formed by sodium, oxygen, calcium, and chlorine are Na+, O2-, Ca2+, and Cl-.
Step-by-step explanation:
The Lewis symbols for the most stable ions formed by sodium, oxygen, calcium, and chlorine are as follows:
- Sodium forms a cation (Na+) by losing one electron. Its Lewis symbol is Na²+.
- Oxygen forms an anion (O2-) by gaining two electrons. Its Lewis symbol is O²-.
- Calcium forms a cation (Ca2+) by losing two electrons. Its Lewis symbol is Ca²+.
- Chlorine forms an anion (Cl-) by gaining one electron. Its Lewis symbol is Cl&sup-.