Ions and ionic bonds — practice question

Which row shows how an ionic bond is formed between a sodium atom and a chlorine atom?

• Asodium atom: two electrons are lost; chlorine atom: two electrons are gained
• Bsodium atom: one electron is gained; chlorine atom: one electron is lost
• Csodium atom: two electrons are gained; chlorine atom: two electrons are lost
• Dsodium atom: one electron is lost; chlorine atom: one electron is gained