-
Contributed the theory that everything is made up of atoms that move around constantly.
-
-
Proposed that all atoms were held together by attractions we now call ‘forces.’
-
One of the pioneers in founding modern atomic theory.
-
Introduced the term ‘electron’ as the fundamental unit quantity of electricity.
-
Discovered electrons and isotopes.
-
Founded quantum theory, a theory describing the interactions of elementary particles or energy states.
-
Established our basic image of atom- rings of electrons orbiting a positively charged nucleus.
-
He established that the nucleus was: very dense, very small and positively charged by probing alpha particles in a piece of thin gold foil. He also assumed that the electrons were located outside the nucleus.
-
Arranged the periodic table by atomic numbers and discovered that the atomic number of an element is equal to the number of protons in the nucleus. He also determined the charges on the nuclei of most atoms using x-ray tubes.
-
Created a liquid drop model of the atomic nucleus.
-
Discovered the neutron.