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Chemistry part 1

periodic table regions, atom history

Alkali Metals most reactive metals on the Periodic Table, have one valence electron, soft and shiny
Alkaline Earth Metals have 2 valence electrons, very reactive metals
Transition Metals elements in groups 3-12, good conductors of electricity, change from more reactive on the left to less reactive on the right
Metalloids have characteristics of both metals and nonmetals, used as semiconductors
Rare Earth Metals soft and shiny metals, elements 93 and up are synthetic
Halogens most reactive nonmetals on the Periodic Table, have 7 valence electrons
Noble Gases stable, don't normally form compounds, all exist in Earth's atmosphere
proton positive particle in an atom
neutron neutral particle in the nucleus of an atom
electron negative particle that "orbits" the nucleus of an atom in certain energy levels
electron cloud region around the nucleus of an atom where electrons are likely to be found
valence electrons located on the outermost energy level of an atom, involved in chemical bonding
Bohr model atom drawing that shows energy levels where electrons reside
Electron Cloud model most modern model of an atom, electrons reside in a region around the nucleus
John Dalton credited with the solid, indivisible "marble" model of the atom
J.J. Thomson credited with the "Plum Pudding" model of the atom that had a solid positive atom with negative particles embedded within it
Ernest Rutherford credited with the "Solar System" model of the atom where electrons "orbit" the nucleus, atoms are made of mostly empty space
Niels Bohr credited with the atom model where electrons "orbit" the nucleus in well-defined pathways
James Chadwick credited with suggesting that neutrons have a neutral charge and reside in the nucleus of an atom with the protons
Edwin Shrodinger credited with the most modern "Electron Cloud" model of the atom where electrons orbit the nucleus randomly
Dmitri Mendeleev created the first Periodic Table
stable an atom can become this way when its outermost energy level is full of electrons
neutral an atom can become this way if it has the same number of protons as electrons
Created by: lfurrow13