Vocab Vocb dkrause published on October 31, 2010 Stacked 1/10 is the smallest particle of an element atom electron nucleus 2/10 is the sum of the protons and neutrons in the nucleus of an atom Hint: 1 choice proton mass number energy level 3/10 properties of the elements repeat in each period Hint: 1 choice group periodic table plasma 4/10 the verticle rows in the periodic table Hint: 1 choice plasma period group 5/10 element is classified as this Hint: 1 choice metal malleable transition metal 6/10 is the ability of an object to transfer heat or electricity to another object Hint: 1 choice malleable conductivity ductile 7/10 element that lacks most of the properties of a metal Hint: 1 choice halogen diatomic nonmetal 8/10 elements in group 18 Hint: 1 choice semiconductor nobel gas metalloid 9/10 the atomic nuclei of unstable isotopes release fast-moving particles and energy Hint: 1 choice radioactive decay radioactivity beta particle 10/10 are radioactive isotopes that can be followed through the steps of chemical reaction or an industrial process Hint: 1 choice tracer alpha particle beta particle