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science unit 4 def.

atomic mass average mass of one atom of an element.
periodic table a chart where all elements are organized into periods and groups according to their properties.
chemical symbol one-or-two letter code that stands for and element.
period a row of elements in the periodic table arranged by atomic mass.
group column of elements in the periodic table, in which elements have certain properties in common.
matter the material that all objects and substances are made of.
element substance that are the building blocks of all matter.
compound matter made of 2 or more elements the elements in a compound are chemically bonded.
atom smallest particle into which and element can be divided and still have properties of that element.
electron negatively charged particle found outside the nucleus of an atom.
nucleus the center of an atom.
proton positively charged particle located in the nucleus of an atom.
neutron in an atom particle with a neutral charge located in the nucleus.
energy level the amount of energy carried by an electron in an atom.
isotope atoms of the same element with different numbers of neutrons in an atom.
mass number amount of matter in something.
atomic number number of protons in the nucleus of 1 atom.
metal element that is made of a hard wearable element to make jewelry or even cars.
malleable can be molded in to shapes.
ductile a term used to describe a material that can be pulled out in to a long wire.
conductivity the ability of an object to transfer heat or electricity to another object.
reactivity the ease and speed with which an element combines, or reacts with other elements and compounds.
corrosion the gradual wearing away of a metal element due to chemical reaction.
alkali metal an element in Group 1 of the periodic table.
alkaline earth metal an element in Group 2 of the periodic table.
transition one of the elements in Group 3 through 12 of the periodic table.
alloy a mixture of two of more elements, one of which is metal.
nonmetal an element that lacks most of the properties of a metal.
diatomic molecule an molecule consisting of two atoms.
halogen an element found in Group 17 of the periodic table.
noble gas an element in Group 18 of the periodic table.
metaloid an element that has some characteristics of both metals and nonmetals.
semiconductor a substance that can conduct electricity under some condition.
Created by: Paul Clark