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Chemistry Unit 2

QuestionAnswer
periodicity the repetition of similar properties of elements after regular intervals
metals lose electrons until they have no valence electrons in shell become positively charged
nonmetals gain electrons until they have 8 valence electrons in shell become negatively charged
noble gasses do not gain /lose electrons
chemical new substance with new chemical properties created
physical change in properties affecting appearance or form
coulombic attraction charges attract/repel each other like poles of a magnet; opposites attract/likes repel
valence electrons the number of electrons in the highest energy level are the outermost electrons of an atom; repelled by nearby core electron, offsetting some attraction between valence electrons and the nucleus
core electrons experience a greater force of attraction than valence electrons, due to their reduced distance from the nucleus
negatively charged electrons attracted to the positively charged nucleus
effective nuclear charge valence electrons do not experience the pull of the nucleus
atomic radius measure of the size of its atom: increases as you move down a group; decreases as you move across left to right
ionization energy amount of energy required to remove an electron: increases up and right on the periodic table
electron affinity amount of energy released by gaining an electron: increases up and right on the periodic table
electronegativity measure of the ability of an atom to attract shared electrons: decreases as you move down the group; increases as you move left to right across a period
cation positive ion
anion negative ion
Created by: stargirl123
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