Given a scientific question, generate a correct answer to it.

[EX Q]: When atoms gain or lose electrons, they can form electrically charged particles called what?
[EX A]: ions

[EX Q]: What kind of planet do we consider ceres to be?
[EX A]: dwarf planet

[EX Q]: The regions of a material where the north and south poles of atoms are aligned are called what?
[EX A]:
magnetic domains