-
370
aristotle B.C.
"Atom." Atom. N.p., n.d. Web. 05 Mar. 2014.He thought atoms didnt exist, and that the entire world was made from 4 elements:
Fire
Air
Earth
Water
He also denied the existence of atoms.
He said this around 380 B.C.
The method he used to figure this out was using hid own argument which were Dialectical which is based on logical deduction. Also empirical, based on practical considerations. -
450
Democritus BC
"HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER." HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER. N.p., n.d. Web. 04 Mar. 2014.He said that everything is made up of tiny,invisible parts.
said this approximatelyn 460 BC
Democritus disputed the claim that empty space cannot exist.
Also he said that the underlying atoms of the world cannot be destroyed just rearranged.Neither matter nor energy is created or destroyed.
He figuered this out by using various logical arguments.
Also he used every day experiences too. -
Dalton A.D.
"HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER." HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER. N.p., n.d. Web. 04 Mar. 2014.Dalton noted that various elements contain differing ratios of atoms, and devised a system or classifying atoms based on their weight.
He discovered the actual structure of atoms.
Made the Atomic theory and Dalton's law.
He used a journal and recorded over 20,000 observations to figure this out.
Not just any journal a mathematical journal.
He teached mathematics and natural philosophy at New College.
Thought the atom looked like a small, silver sphere. -
Thomson A.D.
"HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER." HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER. N.p., n.d. Web. 04 Mar. 2014.Discovered electrons and isotopes
Also invented the Mass spectrometer
Won the Nobel Prize in physics
He used experiments to make his discovery
He thought the atom very small negatively charged particles.
The positive and the negative charges in an atom are equal in magnitude, due to which an atom is electrically neutral. It has no over all negative or positive charge.
An atom consists of a sphere of positive charge with negatively charged electron embedded in it -
Rutherford A.D.
"HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER." HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER. N.p., n.d. Web. 04 Mar. 2014.Discovered that an atom haas a nucleus inside
He also said the nucleus is made up of
Electrons
Protons
Neutrons
He discovered this by using experiments
For example:
The Gold Foil experiment
Thought the atom looked like a small dense core of positively charged particles surrounded by a swirling ring of electrons. -
Bohr A.D.
"HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER." HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER. N.p., n.d. Web. 04 Mar. 2014.Discovered and theorized that the structure of an atom is in fact very small.
Suggested that electrons can have any certain amounts of energy
First to discover electrons traveled in separate orbits
He used the Quanttum Theory to help him on most of his research of atoms.
Thought the atom looked like a small, positively charged nucleus surrounded by orbiting electrons.
Element Bohrium is named after him also. -
Heisenberg and Schrodinger A.D.
"Atom." Atom. N.p., n.d. Web. 05 Mar. 2014.Heisenberg:
One of the key creators of Quantum Mechanics.
Made an equation which described energy waves.
He used mathematical systems to atomic physics to discover these things.
Also used the Schrodinger equation
He brought understanding to atoms electrons
Schrodinger:
He thought the atom looked liike rays or Particle waves.
Schrodinger began studying and publishing works on quantum physics.
Schrodinger continued to work with quantum physics and mechanics until his death in 1961.
