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As may be seen in the microscopic view of liquid bromine, 1  Liquids are made up of very small particles (atoms, molecules, and/or ions). 2  The particles that make up a liquid: 3  are close together with no regular arrangement,  vibrate, move about, and slide past each other.
The exposure to bromine immediately dangerous to life and health (IDLH) is 3 ppm. Bromine is classified as an extremely hazardous substance in the United States as defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act (42 U.S.C. 11002), and is subject to strict reporting requirements by facilities which produce, store, or use it in significant quantities.