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Chemistry Test 1-2


believed that particles could be divided until a basic particle that cannot be broken down further is reached Democritus
called the particle the atom Democritus
atom is from the Greek word that means____ indivisible
thought mnatter was continuous; views set back the development of chem. for 2000 years; did not believe in the atom Aristotle
mass is neither created or destroyed during ordinary chemical reactions or physical changes Law of Conservation of Mass
a chemical compound contains the same element in exactly the same proportions by mass regardless of the size of the sample or the source of the compound Law of Definite Proportions
relates to compounds made of the same elements Law of Multiple Proportions
the smallest particle of an element that keeps the chemical properties of that element atom
2 regions of the atom: nucleus and electron cloud
observed that objects can have a positive or negative charge and that like charges repel while unlike charges attract Ben Franklin
first to realize that an atom's structure is related to electricity Michael Faraday
resulted from investigations into the realtionship between matter and electricity discovery of atomic structure
tube containing a gas at low pressure cathode ray tube
showed that the cathode rays are made of identical negatively charged particles later called electrons JJ Thomson
confirmed that electrons are negative and discovered their mass Robert Millikan
mass of an electron 9.11x10^-28 g
discovered plum pudding model JJ Thomson
discovered planetary model Rutherford
discovered Bohr Model Neils Bohr
discovered the Quantum Mechanical Model (Schrodinger Model) Schrodinger
described the atom as neutral with the same number of negative charges stuck in a ball of positive charges plum pudding model
compared an atom to a solar system with electrons moving about the nucleus like planets around the sun planetary model
said the electrons with a specific amount of energy moved in a particular orbit; also said that only a certain number of electrons fit in a particular orbit Bohr Model
current atomic model; describes the atom as a nucleus surrounded by an electron cloud; electrons moved around the nucleus in regions of space based on the amount of energy the electrons hold; no precise orbits Schrodinger Model
discovered the nucleus Rutherford
location of the atom's greatest mass nucleus
the simplest hydrogen atom has_ proton 1
mass of a proton 1.673 x 10^-24 g
mass of a neutron 1.675 x 10^-24 g
discovered the proton Goldstein
discovered the neutron Chadwick
___ provides volume for an atom electron cloud
an atom has _ energy levels 7
__ and __ were the first to say electrons move in an atom Rutherford and Bohr
the distance from the center of the nucleus to the outer part of the electron cloud atomic radius
atoms of the same element that have different masses isotopes
H-1 protium (simplest atom)
H-2 deuterium
H-3 tritium (radioactive and man made)
any isotope of any element nuclide
the element that all atomic masses are compared to Carbon-12
ratio of the average atomic masses of the naturaly occurring isotopes of an element to 1 amu atomic weight (atomic mass)
Created by: lovecamille018