1. How does an ion differ from an atom? 3. To become a negative ion, does an atom lose or gain electrons? 3. Which elements tend to form ionic bonds? 4. Which elements tend to form covalent bonds? 5....

1. How does an ion differ from an atom?

3. To become a negative ion, does an atom lose or gain electrons?

3. Which elements tend to form ionic bonds?

4. Which elements tend to form covalent bonds?

5. How many electrons are shared in a double covalent bond?