Atomic History Flashcards

Terms Definitions
Gold foil
Rutherford
rutherford
discovered the nucleus
1897
Thomson discovered electron
Dalton
first atomic theroy
1896
henri becquerel discovered radioactivity
Plum pudding model
J.J. Thompson
1932
Chadwick discovered the neutron
Thomson
used Cathode Ray Tubes
1919
rutherford published discovery of proton
millikan
conducted the oil drop experiment
1911
Rutherford published discovery of nucleus (based on Gold Foil Experiment of 1909)
established a distinction between molecules and atoms; stated the law on gases, and calculated the "true affinity of heat"
amedeo avogadro
Democritus
Said atoms are indivisible and indestructible - not based on the scientific method.
1924
De Broglie suggested wave-like nature of electrons
Mendeleev
arranged first periodic table by atomic mass
Neils Bohr 1922
said electrons move in orbits
discovered neutrons, helped with the atomic bomb
James Chadwick
Used a modification of Millikan's experimental setup
J.J. Thompson
spectroscopy
the study of the properties of light that depend on wavelength
Ernest Rutherford 1911
conducted gold foil experiment which led him to the nuclear model of an atom - extremely small, dense positively charged nucleus surrounded by empty space sparesly occupied by electrons
THE DISCOVERY OF THE ELECTRON RESULTED FROM EXPERIMENTS USING
CATHODE RAYS
Bohr
Said an atoms is a small positively charged nucleus, electrons travel in a circular orbit around the nucleus.
Albert Einstein 1915
states that matter and energy were interchangable in his theory of relativity e=mc^2
1st to state that the atom has a nucleus in the center with electrons orbiting around it; developed the saturnian system model
Hantaro Nagaoka
__________________ INTRODUCED A MODEL OF THE ATOMS IN WHICH ELECTRONS MOVED AROUND THE NUCLEUS IN WELL, DEFINED PATHS (LIKE CONCENTRIC CIRCLES) WITHA FIXED AMOUNTS OF ENERGY, THIS MODEL IS OFTEN REFERRED TO AS THE
NEILS *BOHR* , (THE PLANETARY MODEL)
Why did Rutherford conclude the nucleus to be small?
The particles rarely hit it straighton.
'Discovered' the nucleus
Rutherford
schrodinger
treated electrons as waves
Cathode Ray Tube
J.J. Thompson
James Chadwick
discovered neutron using radiation
USING X-RAYS,___________ DISCOVERED THAT ALL ATOMS OF THE SAME ELEMENT HAVE THE SAME NUMBER OF PROTONS IN THE NUCLEUS (ATOMIC #)
HENRY *MOSELY*
1968
Discovery of quarks (sub-atomic particles which make up protons and neutrons)
330 bc
aristotle's refuted D's atomic model
discovered 8 elements including plutonium, americium, curium, berkelium, californium, and einsteinium
Glenn Seaborg
400 BC
Democritus' model defined the indivisible atom
Moseley
arranged periodic table by atomic number
(Ernst) Rutherford
discovers protons/ nucleus, Gold foil experiment, most of atom is empty space, most of the positive charge of the atom is housed in a very small space
his principle of quantum mechanics resulted in the discovery of allotropic forms of hydrogen and made up the uncertainty principle
Werner Heisenberg
WHO DISCOVERED THE *NUCLEUS* BY BOMBARDING GOLD FOIL WITH POSITIVELY CHARGED PARTICLES AND NTING THAT SOME PARTICLES WERE WIDELY DEFLECTED?
ERNEST RUTHERFORD
Proust
Gave us the Law of Definite Proportions
2009
First test of LHC (Large Hadron Collider), largest and most powerful atom smasher ever built
ground state
the lowest energy state of an atom
one of the 1st pre-socratic greeks to develop the theory of atomism; successor of democritus, believed that the universe consists of 2 different elements: the full and the empty
Leucippus
___________ WS THE FIRST TO SUGGEST T HAT ALL MATTER IS MADE OF TINY, INDIVISIBLE PARTICLES HE CALLED *ATOMOS*, WHICH IS THE GREEK WORD FOR INDIVISIBLE
DEMOCRITUS
ANTOINE LAVOISIER
IN 1785 PUBLISHED THE LAW OF CONSERVATION OF MASS OR MATTER
energy level
a region around the nucleus in which electrons are found
creator of the 1st version of the periodic table
Dmitri Mendeleev
solar system model
created by Bohr, nucleus is center of atom. Nucleus is massive, and positively charged. Electrons move in circles around around the nucleus in specific orbits
Electron Cloud
A region around the nucleus of an atom where electrons are likely to be found.
John Dalton 1803 - 1808
developed atomic theory - all matter is made up of atoms, cannot be created or destroyed, each element has identicle atoms, each set of atoms have unique properties, chemical reactions are simple arrangements of atoms
________ DISCOVERED THE ELECTRON WHILE CONDUCTING EXPERIMENTS WITH A __________
J.J. *THOMPSON*, CRT ( CATHODE RAY TUBE)
Atoms are indivisible
Democitus
1926
schrodinger discovered wave-equation of electron; heisenberg proposed uncertainty principle
(Robert) Bunsen
invented the spectroscope
Law of Definite Proportions
Dalton
1913
Bohr proposed his model
discovered spontaneous radioactivity; worked with uranium
Antoine Becquerel
Atoms is mostly empty space
Rutherford
(J.J.) Thompson
discovered the electron in 1897
discovered the conductivities of electrolytes, certain compounds thar dissociate in solution to ions, determined that the impact of temperature on reaction rates and formulates, studied conductivity of salt
Svante Arrhenius
Goldstein
Discovered protons using the cathode ray.
1970's
String Theory adopted to suggest possible final building blocks
absorption spectra
Produced when a continuous spectrum passes through a cool gas, a series of black lines resulting from energy which is added to electrons, who then jump when they absorb certain frequencies of light; match exactly to the colored lines
found similarities in certain elements and did experiments on powered platinum
Johann Dobereiner
Chadwick
Credited with the discovery of the neutron
quantum
minimum quantity of energy that can be lost or gained by an atom, the amount of energy required to move an electron from one energy level to another energy level
taught by Leucippus, came up with the first atomic theory
Democritus
Lavoisier
Gave us the Law of Conservation of Mass
ERWIN SCHRODINGER CONTRIBUTED TO THE MODERN MODEL OF THE ATOM WHICH IS CALLED THE
QUANTUM MECHANICAL MODEL
Dmitri Mendeleev 1870
father of modern periodic table, left blank spaces for new elements
states that gases of equal volumes, temps, and pressures will contain the same # of molecules
law on gases
Amedeo Avogadro 1811
came up with the 'mole' until, equal volumes of gases as the same temperatrue and pressure have the same number of molecules
JOSEPH LOUIS PROUST
IN 1795 PUBLISHED THE LAW OF CONSTANT COMPOSITION
ROBERTA A. MILIKAN'S EXPERIMENTS DISCOVERED
THE MASS ANDTHE CHARGE OF THE ELECTRON
/ 74
Term:
Definition:
Definition:

Leave a Comment ({[ getComments().length ]})

Comments ({[ getComments().length ]})

{[comment.username]}

{[ comment.comment ]}

View All {[ getComments().length ]} Comments
Ask a homework question - tutors are online