Final answer:
Plasma is the state of matter characterized by ionized particles, no definite shape or volume, and good electrical conductivity.
Step-by-step explanation:
The state of matter that is characterized by ionized particles, no definite shape or volume, and good electrical conductivity is plasma. Plasma is often referred to as the fourth state of matter, in addition to solids, liquids, and gases. It is formed when a gas is heated to high temperatures or subjected to strong electromagnetic fields, causing the electrons to detach from their parent atoms, resulting in the ionization of the gas.
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