Related Words

Nuclide: An atom or ion with a specified mass number and atomic number. For example, uranium-235 and carbon-14 are nuclides.

Nuclide Symbol: A symbol for an nuclide that contains the mass number as a leading superscript and the atomic number as a leading subscript. For ions, the ionic charge is given as a trailing superscript. Fo . . . View Full Definition

Radionuclide: Any radioactive isotope (form) of any element.

Public Health Hazard: A category used in ATSDR's public health assessments for sites that pose a public health hazard because of long-term exposures (greater than 1 year) to sufficiently high levels of hazardous . . . View Full Definition

Mass Number: The total number of protons and neutrons in an atom or ion. In nuclide symbols the mass number is given as a leading superscript. In isotope names (e. G. Carbon-14, sodium-23) the mass numbe . . . View Full Definition

Atomic Number (Z): The number of protons in an atomic nucleus. The atomic number and the element symbol are two alternate ways to label an element. In nuclide symbols, the atomic number is a leading subscript; . . . View Full Definition

Isobar: The line drawn on a weather map connecting points of equal barometric pressure.

Atomic Weight: The sum of the weights of an atoms protons and neutrons, the atomic weight differs between isotopes of the same element.