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RSM Chp. Four

QuestionAnswer
atom is the smallest particle of an element
electron the negatively charged particles
nucleus a tiny region in the center of the atom
proton positively charged particles in the nucleus
energy level an electron's movement is related to the specific amount of energy in an atom
neutron particle inside the nucleus of an atom with no electrical charge and the nearly the same mass as a proton
atomic number the number of protons in the nucleus of an atom
isotope atoms of the same lement that have different numbers of neutrons.
mass number is the sum of the protons and neutrons in the nucleus of an atom
atomic mass is the average mass of all the isotopes of an element.
periodic table is an arrangement of the elements showing the repeating pattern of their properties.
period the periodic table is organized in horizontal rows
group the vertical columns of the periodic table consisting of elements with similar characteristic. Also known as a family
chemical symbol is a representation of an element usually consisting of one or two letters
metal are elements that are good conductors of electric current and heat
malleable is a material that can be hammered or rolled into flat sheets or other shapes
ductile is a material that can be pulled out, or drawn, into a long wire
thermal conductivity is the ability of an object to transfer heat
electrical conductivity the ability of an object to transfer electric current by free flowing electrons
reactivity the ease and speed with which a substance reacts with other substances
corrosion the gradual wearing away of a metal due to a chemical reaction
alkali metal the metals of Group 1 from Li to Fr....so reactive that they are never found as uncombined elements in nature, only as compounds.
alkaline earth metal the metals of Group 2 and are reactive, but less than Group 1
transition metal the elements in Group 3 - Group 12. Most are never found uncombined in nature
particle accelerator move atomic nuclei faster and faster until they have reached very high speeds used in synthesizing new elements by colliding neulei
nonmetal is an element that lacks most of the properties of a metal.
diatomic molecule a molecule that consists of two atoms
halogen means salt forming Group 17 F- astatine...
inert gas Group 18 do ordinarily form compounds because atoms do not gain, lose or share elections and are highly un-reactive
semimetal have properties of metals but also have properties that are typical of nonmetals.
semiconductor substances that can conduct electric current under some conditions but not under other conditions
radioactive decay the atomic nuclei of unstable isotopes release fast-moving particles and energy
radioactivity spontaneously emits radiation
alpha particle consists of two protons and two neutrons and is positively charged
beta particle is a fast-mvong electron given off by a nucleus during radioactive decay
gamma radiation constist of high-energy waves, similar to X-rays.
tracer are radioactive isotopes that be followed through the steps of a chemical reaction or industrial process.
Created by: gayledains