He give the name to the atom
Proposed a mechanical universe with small solid mass in motion
Proposed an atomic theory with spherical solid masses in motion
Study the effect of electricity on solutions
Arranges elements in 7 groups.He discovered that the properties of element were periodic functions of their atoms weigh
He investigated the properties of cathode rays, showing that they travel in straight lines, cause fluorescence when they fall on some substances, and that their impact can produce great heat.
Proposed that electricity was made of discrete negative particles called electrons
Was the first person to discover electromagnetic radiation in a wavelength range commonly known as X-rays today.
Discovered the electron.He demonstrated that cathode rays were negatively charged. In addition, he also studied positively charged particles in neon gas.
Used the idea of quanta(discrete units of energy) to explain hot glowing matter
Developed an electrical device to click when hit with alpha particles
Oil drop experiment determined the charge (e=1.602 x 10 -19 coulomb) and the mass (m = 9.11 x 10 -28 gram) of an electron.
He carried out the Geiger–Marsden experiment, which demonstrated the nuclear nature of atoms by deflecting alpha particles passing through a thin gold foil.
Using x-ray tubes, determined the charges on the nuclei of most atoms.
He proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another.
Discovered that electrons had a dual nature-similar to both particles and waves. Particle/wave duality.
:Described atoms by means of formula connected to the frequencies of spectral lines. Proposed Principle of Indeterminacy - you can not know both the position and velocity of a particle.
Viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom.
Using alpha particles discovered a neutral atomic particle with a mass close to a proton. Thus was discovered the neutron.
Conducted the first controlled chain reaction releasing energy from the atoms nucleus.
