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A class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity
An atom with the same number of protons and a different number of neutrons from other atoms of the same element.
A horizontal row of elements in the periodic table showing the repeating pattern of their properties
The ease and speed with which an element combines, or reacts, with other elements and compounds.
A radioactive isotope that can be followed through the steps of a chemical reaction or industrial process.
A machine that moves atomic nuclei at higher and higher speeds until they crash into one another, sometimes forming heavier elements.
The ability of a substance to spontaneously emit radiation; a property of unstable isotopes.
The process in which the atomic nuclei of unstable isotopes release fast-moving particles and energy.
Elements that have some properties of metals but also have properties that are typical of nonmetals.
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