Unit 2 Exam Study Guide

Proposed that matter was composed of tiny indivisible particles; didn't use any experiments

• Chadwick's Discovery

• John Dalton's Discovery

• Democritis' Discovery

• Schrodinger's Discovery

medieval chemistry; the mixture of science and mysticism

• Thomson's Experiment

• Rutherford's Model

• Alchemy

• Bohr's Discovery

all matter has indivisible and indestructible atoms with distinct masses and properties; based on other's theories

• John Dalton's Discovery

• Chadwick's Discovery

• Bohr's Discovery

• Schrodinger's Discovery

- Billiard Ball Model
-- atom is a uniform, solid sphere

• Schrodinger's Model

• Thomson's Model

• Dalton's Model

• Rutherford's Model

1) Elements are composed of small indivisible particles called atoms
2)Atoms of the same element are identical; atoms of different elements are different
3)Compounds are formed by combinations of two different atoms
4)A chemical reaction is a rearrangement of atoms, but not changed

• Becquerel's Discovery

• Dalton's Four Postulates

• Thomson's Discovery

• Rutherford's Model

accidentally discovered spontaneous emission of radiation from the nucleus and discovered radioactivity

• Thomson's Discovery

• Schrodinger's Discovery

• Bohr's Discovery

• Becquerel's Discovery

cathode ray tube; deflection of charges that concluded atoms are composed of positive and negative particles

• Dalton's Experiment

• Thomson's Experiment

• Thomson's discovery

• Bohr's Experiment

Atoms have negative particles called electrons

• Thomson's Discovery

• Becquerel's discovery

• Dalton's Discovery

• Bohr's Discovery

Plum Pudding Model: The atom is made up of negative electrons (plum) equally mixed in a sphere of positive materials.(pudding)

• Becqerel's model

• Thomson's Model

• Bohr's Model

• Dalton's model

Rutherford's Discovery

1)Discovered the nucleus - the dense center where all the positive charges are located in an atom.
2)Atoms are mostly empty space
3)Discovered protons

• Dalton's Discovery

• Thomson's Discovery

• Bohr's Discovery

• Rutherford's Discovery