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8-Science Vocab 1.3

8th grade science vocab

TermDefinition
Reactive Indicates how likely an element WILL undergo a chemical CHANGE.
Metal Elements that are GOOD CONDUCTORS OF ELECTRICITY and HEAT well and have a SHINY appearance; can be shaped easily by hammering/pounding or bending or drawn into a long wire; are solid at room temperature.
Nonmetal Elements on the right side of the periodic table; most are GASES and have dull surfaces and cannot be shaped by hammering; they are POOR CONDUCTORS of heat and electric current.
Metalloid Elements that have properties of BOTH METALS AND NONMETALS. Silicon is a metalloid. They are on either side of a zigzag line on the periodic table.
Radioactivity The process by which atoms PRODUCE ENERGY and particles.
half-life The time it takes for one-half (½) of atoms in a sample to decay. Ex.: 1000 samples = 500 atoms with half life.
Alloy A substance made of TWO or MORE METALS MELTED TOGETHER; a mixture of metals.
Lanthanide A series of the 15 METALLIC ELEMENTS with INCREASING atomic numbers from 57 to 71 and beginning with lanthanide through lutetium.
Halogen A group of 5 elements consisting of fluorine, chlorine, bromine, iodine, and astatine.
Noble gas A group of 7 RARE GASES that include helium, neon, argon, krypton, xenon, and usually radon.
Semiconductor A material that is NEITHER A GOOD CONDUCTOR NOR a GOOD INSULATOR but conducts electricity when heat or light is added.
Radioactive decay A process by which a radioactive isotope LOSES SUBATOMIC PARTICLES particles or energy by emitting radiation.
Created by: bryce_25