-
465 BCE
Democritus
The concept of the atom -
427 BCE
Plato
a fifth atomic type must exist which Aristotle later called `ether' -
322 BCE
Aristotle
matter was fundamentally constructed out of atoms. -
Robert Boyle
The first modern chemist. -
Lavoisier
the total mass of products and reactants in a chemical reactions is always the same -
Solid Sphere Model
all objects are made of particles called atoms, and that they are solid spheres that cannot be divided further into smaller particles -
John Dalton
Elements consist of indivisible small particles (atoms). -
Dmitri Mendeleev
arranged in order of increasing atomic weight, -
The Curies
Discovered radium, Polonium -
Solar System Model
central massive positive entity -
Planck's Quantum Theory of light
Different atoms and molecules can emit or absorb energy in discrete quantities only. -
J.J. Thomson
of positive and negative charges. -
plum pudding model
is one of several historical scientific models of the atom. -
Photoelectric Effect
This became known as the photoelectric effect, and it would be understood in 1905 by a young scientist named Albert Einstein. -
Albert Einstein
the photoelectric effect. -
Robert Millikan
there is a fundamental electric charge -
Ernest Rutherford
He discovered alpha and beta rays, set forth the laws of radioactive decay, and identified alpha particles as helium nuclei. -
Henry G.J. Mosely
the true basis of the periodic table -
Neils Bohr
He made foundational contributions to understanding atomic structure. He received the Nobel Prize. -
Schrodinger Equation
H ^ ψ = E ψ \hat{H}\psi=E\psi H^ψ=EψH, -
Schrodinger Equation
H ^ ψ = E ψ \hat{H}\psi=E\psi H^ψ=EψH -
Electron Cloud Model
cannot know exactly where an electron is at any given time -
Werner Heisenberg
the uncertainty principle, -
James Chadwick
the existence of neutrons -
The Alchemist
Its a novel by Brazilian author Paulo Coelho
