Contributors to Atomic Theory

Everything is composed of atoms, Atoms are indestructible, Atoms are always in motion

• John Dalton

• Democritus

• Werner Heisenberg

• James Chadwick

Tags

NGSS.HS-PS1-7

3 Postulates: Everything is made of atoms & cannot be divided, created, or destroyed, All atoms of the same element are alike with the same mass, Atoms join to form compounds but compounds only exist of the same kinds of atom in same proportion

• JJ Thomson

• Neils Bohr

• John Dalton

• Erwin Schrodinger

Tags

NGSS.HS-PS1-7

Discovered ELECTRON, PLUM pudding model, CATHOD RAY tube

• Ernest Rutherford

• James Chadwick

• Democritus

• JJ Thomson

Discovered NUCLEUS which is DENSE and POSITIVE, most of atom is EMPTY SPACE, GOLD FOIL experiment

• John Dalton

• Ernest Rutherford

• Neils Bohr

• Erwin Schrodinger

Tags

NGSS.HS-PS1-8

Electrons orbit in ENERGY LEVELS, Electrons orbit the nucleus at specific distances (orbitals), PLANETARY MODEL

• Neils Bohr

• James Chadwick

• Ernest Rutherford

• John Dalton

Discovered NEUTRON

• Democritus

• Erwin Schrodinger

• Werner Heisenburg

• James Chadwick

Tags

NGSS.HS-PS1-8

UNCERTAINTY Principle: cannot determine the POSITION and VELOCITY of an ELECTRON at the same time

• Ernest Rutherford

• JJ Thomson

• Werner Heisenberg

• Erwin Schrodinger

Schrodinger EQUATION, discovered orbitals (different shaped clouds around nucleus)

• Erwin Schrodinger

• Neils Bohr

• John Dalton

• Ernest Rutherford