Asia Phillips,Antavious Robinson,Shakira Montgomery,April Cook
In the planetary model, a nitrogen atom has a central nucleus, composed of seven protons and seven neutrons, surrounded by seven electrons. The Bohr Model. Scientists soon realized that the planetary model was an inaccurate description of atomic structure.
In 1909 Thomson's plum pudding model of a atom was disproved by one of his former student Ernest Rutherford
Democritus was a Greek philosopher (470-380 B.C.) who is the father of modern atomic thought.
Dalton's atomic theory that all matter consists of indivisible particles called atoms that cannot be created or destroyed, that are the same for a given element, and that combine in fixed proportions to form compounds.
The Rutherford model of the atom was simplified in a well known symbol showing electrons circling around the nucleus like planets orbiting the sun.
In 1913, Neils Bohr, a student of Rutherford 's, developed a new model of the atom. He proposed that electrons are arranged in concentric circular orbits around the nucleus.