-
Solid forms of matter are made of indivisible elements shaped like triangles, believed only 4 elements earth, fire, water, air. -
Atoms are uniform, solid, hard, incompressible indestructible, and move in infinite numbers through empty space until stopped. -
Believed everything was made of extremally tiny particles. -
Explained matter is made of atoms which cannot be created or destroyed in chemical reactions. -
The Billiard Ball Model depicts atoms as spherical. -
Preposed all matter is made of atoms which are indivisible. -
equal volumes of gasses at the same temperature and pressure contain equal numbers of molecules. -
Arranged elements according to value of atomic weights present periodicity of properties (arranged periodic table). -
All atoms contain small negatively charged subatomic particles (electrons). -
The Solar System Model depicts atoms consisting of a nucleus and orbiting electrons. -
Discovered Radioactivity. -
The Plum Pudding Model shows electrons have a negative charge in a sea of positive charge. -
The Plum Pudding Model shows electrons have a negative charge in a sea of positive charge.
-
Any liquid is made of molecules.
molecules are always in random ceaseless motion. -
Electrons have a discrete quantifiable charge. -
Atoms are tiny dense positively charged core (nucleus). -
Explained some physical quantities only take discreate values. -
Thought that the frequency of x-ray emitted is proportional to the atomic number. -
Erwin Schrodinger said electrons do not follow sharply defined orbits. -
The Electron Cloud Model shows the area around the nucleus that electrons are most likely to be found.
-
James Chadwich proved the existence of neutrons. -
Believed all metals were made formed from 2 principals mercury and sulfur.