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  • Ion
  • An atom that has gained or lost one or more electrons and thus has either a positive (cation) or negative (anion) charge.
  • Inert
  • a chemically inactive element, compound or material. Because of their extremely low chemical activity the noble gasses are considered to be inert substances. This term is also used for subst
  • Inner-Transition Metals
  • The thirty elements of the Lanthanides and Actinides series, which are sub-series of the Transition Metals.
  • Hyaluronic acid
  • A viscous polysaccharide found in the connective tissue space and the synovial fluid of movable joints and the humors of the eye; it protects tissue.
  • Homogeneous
  • A substance or material that contains only one kind of compound or one element. Homogeneous is Latin for "the same kind". An example of a homogeneous substance would be pure water,
  • Heterogeneous
  • A mixture or material consisting of more than one substance. The earth's atmosphere is heterogeneous in that it typically consists of 20.7% oxygen, 78% nitrogen, 0.93% argon and 0.03% CO2 wi
  • Heat of Vaporization
  • The heat required to convert a substance from the liquid to the gaseous state with no temperature change. This is also called the latent heat of vaporization.
  • Heat of Fusion
  • The heat required to convert a solid into a liquid with no temperature change. This is also called the latent heat of fusion or melting.
  • HDPE (high density polyethylene)
  • The structure is similar to PVC except that there is no chlorine (Cl) associated with the molecule. The tight structure makes it very dense.
  • Hazardous Material (HazMat)
  • Any material or substance, which even in normal use, poses a risk to health, safety, property or the environment. Hazardous materials are broken down into nine primary classes by the United
  • Halogens
  • The reactive nonmetals that are in Group 17 of the periodic table. All of these elements are electronegative.
  • Half-life
  • The time it takes for one-half of the atoms of an unstable element or nuclide to decay radioactively into another element or nuclide.
  • Group
  • The vertical columns (major classes or divisions) into which elements are arranged in the periodic table of elements. There are three common numbering systems for these groups: 
  • Gas
  • A substance of very low density that has no definite shape or volume.
  • First Ionization Potential (first ionization energy)
  • The minimum amount of energy needed to remove the outermost (highest energy) electron from a neutral atom in the gaseous state.
  • Fibrosis
  • Formation of fibrous tissue as a reaction or as a repair process; may be result of treatment and/or disease.
  • Filling Orbital
  • The orbital of an element that is only partially filled with electrons when an atom is at a neutral state electrically.
  • Fahrenheit
  • The temperature scale where 32 degrees is the freezing point of water and 212 degrees at 760mm Hg (sea level) is the boiling point of water. To convert from Fahrenheit to centigrade, subtrac
  • Explosion
  • The sudden and violent release of mechanical, chemical or nuclear energy from a confined space which creates a heat wave that travels at subsonic speeds. Often used interchangeably with deto
  • EPA (Environmental Protection Agency)
  • Created in 1970 as an agency of the United States federal government, charged with protecting the environment and enforcing environmental laws and regulations. The EPA did not play a signifi
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