-
Democritus's model stated that matter consists of invisible particles called atoms and a void (empty space).
-
He figured out the 5 regular solids, known as the Platonic solids.
-
He made pioneering contributions to all fields of philosophy and science, he invented the field of formal logic , and he identified the various scientific disciplines and explored their relationships to each other.
-
He said that any substance that can be broken into 2 or more substances is not an element
-
They thought all metals are composed of mercury and sulfur and that it is possible to change base metals into gold.
-
Lavoisier is most noted for his discovery of the role oxygen plays in combustion.
-
He hypothesized that an atom is a solid sphere that could not be divided into smaller particles.
-
Dmitri Mendeleev devised the periodic classification of the chemical elements, in which the elements were arranged in order of increasing atomic weight.
-
Pierre and Marie Curie discovered the strongly radioactive elements polonium and radium, which occur naturally in uranium minerals. Marie coined the term radioactivity for the spontaneous emission of ionizing, penetrating rays by certain atoms.
-
He made this model because it explains the two types of static electricity, he suggested that the atom consisted of positive 'dough' with a lot of negative electrons stuck in it.
-
He figured out the measurement of the elementary electric charge
-
Ernest Rutherford postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay.
-
He made this to show where the planets are and what they look like from space.
-
He experimentally demonstrated that the major properties of an element are determined by the atomic number, not by the atomic weight, and firmly established the relationship between atomic number and the charge of the atomic nucleus.
-
He discovered that energy and mass are interchangeable
-
The model is a way to help visualize the most probable position of electrons in an atom.
