Early Theories
Who was the first person to use the term "atom," meaning indivisible?
Democritus
Who discovered the electron using cathode ray tube experiment?
JJ Thomson (figured out the electrons)
Neil Bohr's model proposed the atom:
Electrons orbit the nucleus in fixed energy levels.
Who discovered the nucleus through the gold foil experiment? Some rays passed through, while others reflected at different angles.
Rutherford
Which philosopher believed matter was made up of earth, air, fire, and water?
Aristotle
JJ Thomson proposed which model of the atom? (Today we use the chocolate chip cookie dough example, but what was the original analogy)
Plum Pudding Model
The modern model of the atom is called:
The Quantum Mechanical Model (electrons are in a cloud like region with different energy levels around the nucleus)
Which experiment helped discover the electron?
The Cathode Experiment
What was the main conclusion from Rutherford's experiment? (Gold foil)
Atoms have a dense, positively charged nucleus
Who discovered the neutron, which has a neutral or no charge?
James Chadwick
Schrodinger & Heisenberg developed the most accepted and current model of an atom to date, which is called:
A cloud like model.
Which experiment measured the CHARGE of the electron? This was done by Milikan
The oil drop
Which scientist is associated with the uncertainty principle?
Heisenberg
Who measured the electrons charge with the oil drop experiment?
Millikan
Neil Bohr
Which scientist suggest electrons behave like waves?
Louis
Describe Dalton's contribution to atomic theory
All matter is made of atoms. Atoms are indivisible and indestructible.
All atoms of a given element are identical in mass and properties.
Compounds are formed by a combination of two or more different kinds of atoms.
A chemical reaction is a rearrangement of atoms.
Democritus, Dalton, Thomson, Rutherford, Bohr, Quantum Model
Earliest to current
Which atomic model was FIRST to include a dense nucleus
Rutherford's Nuclear Model (gold foil)
How did Bohr's model differ from Rutherford's model?
Bohr's model focused that electrons orbited the nucleus in a given pattern.