Chemists Flashcards
Memorize
Democritus
about 400 BC: Proposed that all matter is made up of tiny, invisible particles called atomos.
Robert Boyle
Regarded as the first modern chemist. Boyle defined the element as a substance that cannot be broken down into two or more simpler substances.
Joseph Priestle
1794 Discovered oxygen
There are 1,794 priests who breath oxygen
Antoine Lavosier
Proposed the Law of Conservation of Mass.
Joseph Proust
French Chemist. 1799 Proposed Law of Definite Proportions
Proust Proportions 99 proportionate
John Dalton
In 1803, proposed the Atomic Theory of Matter
it was 18:03 6:03 when John realized atomic theories matter
Benjamin Franklin
American philosopher. Flew a kite attached to a key in a thunderstorm to study electricity. Concluded there are two kinds of electrical charges, which he called positive (+) and negative (-).
Michael Faraday
English chemist. 1839 Suggested that the structure of atoms is related to electricity.
it costs 18,390 dollars to get faradays vest
J.J. Thomson
Discovered electrons in 1897, Plum-pudding model
jj ate 18 plums and 97 puddings
Robert Millikan
American physicist. Oil drop experiment. He determined the charge of a single electron
Henri Becquerel
French physicist. 1896, discovered radioactivity
1,896 atomic bombs is called a Becquerel
Ernest Rutherford
Gold Foil Experiment. He proposed that the negatively charged electrons orbited around the nucleus.
Niels Bohr
- Bohr proposed The Planetary Model, or the Bohr’s Model.
Henry Moseley
Established that the atomic number of the atom defines the identity of the element.
miscovered mhe mumber mof motons mefines midentity mof me melement
James Chadwick
In 1932 discovered the existence of neutrons,
Max Planck
suggested that objects emit energy in small, specific amounts called quanta.
Planking takes energy in quanta
Albert Einstein
but can be thought of as a stream of particles. Einstein called these particles photons.
Albert Einstein had a stream of thoughts about photons
Louis de Broglie
de Broglie suggested that electrons be considered waves confined to the space around an atomic nucleus.
Brodie surfed waves
Werner Heisenberg
states that it is impossible to determine simultaneously both the position and velocity of an electron or any other particle.
Erwin Schrödinger
In 1926, Thus electrons do not travel around the nucleus in neat paths proposed by Bohr. Instead, they exist in certain regions called orbitals
schrodingers cat orbited for 19 minutes and 26 seconds
Quantum theory
describes mathematically the wave properties of electrons
