Evolution of the atomic model Flashcards
1
Q
Democritus
A
Atomism: All matter is composed of small invisible particles called atoms.
2
Q
John Dalton
A
Solid sphere / billiard ball model: Atoms are invisible, and compounds are combinations of different types of atoms.
3
Q
J.J. Thomson
A
Plum pudding model: The atom is a sphere, but the positive and negative charges are embedded within it.
4
Q
Ernest Rutherford
A
Nuclear model / gold foil experiment: Electrons orbiting in a set, predictable paths around fixed, positively charged nucleus.
5
Q
Niels Bohr
A
Planetary model: Electrons are arranged in concentric specific circular orbits around the nucleus.
6
Q
Erwin Schrödinger
A
Quantum model: The locations of the electrons could only be described as being part of a “cloud” around the nucleus.
