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Unit4 Vocabulary

atomic mass average mass of one atom of an element
preiodic table a chart where all elements are organized into periods and groups by properties
chemical symbol a one or two letter code that stands for an element
period a row of elements in the periodic table arranged by atomic number
group column of elements in the periodic table
matter anything that has mass and takes up space
element substances that are the building blocks of matter
compound matter made up of two or more elements
atom smallest particle into which an element can be divided and still have the properties of that element
electron negatively charged particle found outside the nucleus
nucleus small round structure in the nucleus of a cell that helps direct how proteins are put together
proton positively charged particles located in the nucleus of an atom
neutron particles with a neutral charfe located in the nucleus
energy level the amount of energy carried by an electron in an atom
isotope an atom with the same number of protons and a diffetent number of neutrons from other atoms of the same element
mass number the sum of protons and neutrons in the nucleus
atomic number number of protons in the nucleus of one atom of an element
metal elements with a shiny surface
malleable a term used to describe a material that can be pounded into shapes
ductile a term used to describe a material that cane be pulled out into a long wire
conductivity the ability of an object to transfer heat or electricity to another object
reactivity the ease and speed with whichan element combines or reacts with other elements
corrosion the gradual wearing away of a metal element due to a chemical reaction
alkali metal an element in group one of periedic table
alkaline earth metal an element in group two of periodic table
transition metal one of the elements in group three through twleve
alloy a mixture of two or more elements of which is a metal
nonmetal an element that lacks most of the properties of a metal
diatomic molecule a molecule consistins of two atoms
halogen group of elements in the periodic highly reactive ninmetals
noble gas a group of elements that generally do not react with other elements
metalliod an element thathas some characteristics of both metals and nonmetals
semiconductor a substance that can conduct electricity under some conditions
Created by: koneal