2.04/ 2.12 electron configuration of ions ticket out the door

Chlorine gains one electron to become

• Cl^-

• Cl⁺

• Cl^2-

• Cl²⁺

Sodium loses one electron to become

• Na^-

• Na⁺

• Na^2-

• Na²⁺

Oxygen has 8 electrons, how many more electrons does it need to reach its octet? HINT: electron configuration is 1s²2s²2p⁴

• 3

• 5

• 2

• 8

What electron configuration matches an oxygen ion? HINT: An oxygen atom has 8 electrons and then gains 2 electrons to become O^2- Use the aufbau diagram of an oxygen ATOM above to help you.

• 1s²2s²2p⁶3s²

• 1s²2s²2p⁴

• 1s²2s²2p⁶

• 1s²2s²2p²