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Chemistry 10-25-12

Atomic Theory 1. All Things are made of matter 2. Same element=same mass 3. Compounds=combination of more than one element 4. Different elements combine in same way
How many electrons are in each level? 1st - 2 2nd - 8 3rd - 8 4th - +
Luster? Shininess
Ductility ability to be streched into wire
Elasticity ability to be streched
Malleability ability to bend without breaking
Conductivity ability to conduct heat
electronegativity ability to attract electrons
melting point temp. at which an element melts
freezing point temp. at which an element freezes
boiling point temp. at which an element boils
said all matter consistes of particles that can't be seperated Democritus
said different types of atoms have different properties Democritus
said all substances are made of earth, wind, water, or fire Aristotle
said atoms are solid sphere Dalton
developed atomic theory Dalton
made "billiard ball model" of atom Dalton
said atom is solid sphere with electrons stuck to it Thomson
preformed Cathode Ray Tube to discover electrons Thomson
made "Plum Pudding Model" of atom Thomson
discovered positive nucleus (protons) Rutherford
said electrons move randomly around nucleus Rutherford
made "Planetary Model" of model Rutherford
preformed Gold Foil Expirement to discover positive nucleus (protons) Rutherford
said electrons in energy levels around nucleus Bohr
said energy levels at fixed distance around nucleus Bohr
said electrons have own pathway Bohr
made "Bohr Model" of atom Bohr
ran flame tests to discover electron energy levels Bohr
developed mathematical equations to describe motion of electrons Schrodinger
made "Electron Cloud Model - Probablity Model" of atom Schrodinger
confirmed existance of neutrons and it's properties Chadwick
studied how elements combine to establish the atomic theory Dalton
valence electrons electrons in outer shell of atom
groups most likely to bond Alkali Metals, Alkaline Earth Metals, Halogens
groups least likely to bond Boron Family, Carbon Family, Nitrogen Family, Oxygen Family, Nobel Gases
Lewis Dot Structure Symbol in middle ; valence electrons as dots surrounding symbol
Bohr Model nucleus surrounded by electron energy levels
Electron Cloud Model nucleus in center with protons and neutrons ; electrons surround nucleus in cloud
Density m/v
how do you find volume? meter stick, water displacement, graduated cylinder
how do you find mass? scale
ion atom that has lost or gained electrons
cation positive ion - more protons
anion negative ion - more electrons
isotope atom that lost or gained neutrons
subatomic particles proton, electron, neutron
particle(s) in nucleus protons, neutrons
negative particle in an atom electron
positive particle in an atom proton
neutral particle in an atom neutron
which particle(s) make up the mass of an atom proton, neutron
how do you find the number of protons in an atom? protons = atomic #
how do you find the number of electrons in an atom? protons = electrons, unless an ion
how do you find the number of neutrons in an atom? neutrons = mass-protons
how do you know how many valence electrons an element has? Bohr Model, Lewis Dot Structure, or group on periodic table
What group # is the Alkali Metals Group 1
What group # is the Alkaline Earth Metals Group 2
What group # is the Boron Family Group 3
What group # is the Carbon Family Group 4
What group # is the Nitrogen Family Group 5
What group # is the Oxygen Family Group 6
What group # is the Halogens Group 7
What group # is the Nobel Gases Group 8
The group # also equals... the number of valence electrons the elements inside that group have
Created by: ermahgerd



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