Answer: transferred, atoms , ions
Explanation:
An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal.
For formation of an ionic compound, the metal lose electrons to form positively charged ions called as cations and non metals gain electrons to form negatively charged ions called as anions.
For example:
Sodium atom will loose one electron to gain noble gas configuration and form sodium cation with +1 charge.
Chlorine atom will gain one electron to gain noble gas configuration and form chloride ion with -1 charge.