Final answer:
The state of matter characterized by ionized particles, no definite shape or volume, and good electrical conductivity is plasma.
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 considered the fourth state of matter, alongside solids, liquids, and gases. In a plasma, atoms are broken apart into positive ions and negative electrons, creating a highly energetic and electrically conductive state.
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