He thought that all substances were built up from only four elements

Atoma which is Greek for ____

Solid Sphere Model or Bowling Ball Model

His Theory: All substances are made of atoms that cannot be created, divided or destroyed

His theory: Atoms of the same element are exactly alike, and atoms of different elements are different in mass and size

Dalton’s Atomic Theory: matter is made up of extremely small indestructible particles called atoma

All atoms of a given element are alike

British scientist, displayed the first cathode ray using a modification of the Geissler Apparatus

Eugen Goldstein: positive ray

John Joseph Thomson

publishes a short article, the existence of an unknown and strange radiation, that is thus quikly named ____

An anode ray is a beam of positive ions that are created by certain types of gas discharge tubes

John Joseph Thomson’s model

His theory: small, dense, positively charged particle present in nucleus called a proton

Danish Physicist discovered energy levels

Electron Cloud Model

permitted na explanation of fine-structure spectral lines

English Physicist; discovered neutrons

neutrons have no electrical charge