Chapter 3: Atoms Flashcards
Who thought matter was continuous?
Aristotle
Who thought of indivisible “atomos?”
Democritus
Who first called particles atomos, from which we get out word atom?
Democritus
Who believed that atoms were spheres surrounded by heat envelopes?
Dalton
Who thought atoms were indivisible and cannot be destroyed?
Dalton
Who first suggested that elements are made of atoms and that the atoms of an element are alike?
Dalton
Who proposed that atoms are hard spheres of different sizes and masses?
Dalton
According to his research with Crookes tubes, which scientist suggested that the cathode rays were made of negatively charged particles?
Thompson
Who first proved that atoms were divisible when he saw evidence of charged particles existing in the atom?
Thompson
What is Thomson’s atomic model called?
Plum Pudding Model
The discovery of electrons demonstrated that atoms are not what?
Indivisble
Most of an atom consists of what?
Empty space
Who developed the nuclear model?
Thompson
Who developed the plum pudding model?
Thomspon
Who developed the Saturnian model?
Nagaoka
In Rutherford’s experiments a beam of what was directed at a piece of gold foil?
Alpha particle emmiter
What was not an observation that led Rutherford to believe that most of the atom’s mass and positive charges were densely packed into a very small space?
Some alpha particles emitted protons as they fell back to their original energy levels
