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chap 17-18 ps

element pure substance
aristotle believed in air fire earth water
element # how many? 117
naturally occuring elements 92
johann Dobereiner triads
periodicity repition of certain properties at periodic intervals when elements are placed in order of atomic mass
John Newlands aranged table in order of atomic mass every eight had similar props: OCTAVES
Dmitri Mendelev in order of atomic mass left blanks for undiscovered elements credited for modern pecha
Henry Moseley counted protons w/ x-rays rearanged pecha into modern one and revised periodic law
periodic law (modern changed from atomic mass to _____) The properties of elements vary in a periodic way with their atomic number
2nd law of thermodynamics all natural processes move toward a state of minimum energy
atoms are most stable with 8 valence electrons octet rule
covalent sharing electrons non metal with non metal high melting temp
ionic low melting temp produce electricity when dissolved in water metal/nonmetal give away and take electrons
mettalic metal/metal
electron sea electrons bounce everywhere
electron affinity strength of attraction to UNBONDED atoms
electronegativity how powefully it can take electrons when bonded (flourine highest)
Created by: pickleman792