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unit4 vocabulary

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 of two letter code that stands for an element;many symbols are abbervationsof the elements
period chemisty: a row of elements in the periodic table arranged by atomic numbers
group colum of elements in the periodic tab, in which elements have certain properties in common;also called chemical family
matter the material that all objects and substances are made of ; anything that has mass and takes up space
element substances that are the building blocks of all matter;an element is made up of one kind of atom
compound matter made of two or more elements elements; the elements in a compound are chemically bonded cannot be separated by physical means, and a compound has properties that are different from the elements that make it up
atoms smallest particle into which an elementcan be divided and still have the properties
electron negativly charged particle found outside the nucleus of an atom
nucleus biology structure near the center of a cell that contains the cell's
proton positively charged particle located in the nucleus of an atom
nuetron 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; determines the electron's average distance from the nucleus.
isotope atoms for the same element with different numbers of nuetrons in the nucleus, and thus different atomic mass; for example ,carbon-12 and carbon-14
mass number the sum of protons and neutrons in the nucleus of an atom
atomic number number of protons in the nucleus of one atom af an atom
mutal a type pf symbiosis in which both partners benefit from living together
malleable a term used to describe meterialthat can be pounded into shapes
ductile a term used to describe that can be pulled out,into a long write
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
corrision the gradual wearing away of a metal element due to a chemical reaction
alki metal an element in group 1 of the periodic table
alki earth metal an element in group 2 of the periodic table
transition metal one of the elements in groups 3 through 12 of the periodic table
alloy a mixture of tow or more elements one of which is a metal
non metal an element that lacks most of the properties of a metal
diatomic molecule a molecule consisting of two atoms
nalogen group of elements on the periodic table
noble gas an element in group 18 of the periodic table
metalloid an element that has some characteristic of both metals and non metals
semi conductor a substance that conduct electricity under some conditions