Periodic Table Vocabulary

indicates how likely an element is to undergo a change

an element that has the properties of both metals and nonmetals

the length of time it takes for half of the atoms in a radioactive sample to decay

elements that have dull surfaces, poor conductors of heat & electricity

a process by which the nucleus of an atom of an element releases energy and particles

the process where the identity of atoms change because the number of protons change

very reactive nonmetals that easily form "compounds" called salts with many metals

special materials that conduct electricity sometimes under some conditions and not under others

elements that conduct electricity & heat & have a shiny appearance

a solid mixture composed of a metal and one or more other substances

elements which were once thought to be available in tiny amounts of Earth's crust