Discovery of Atomic Structure: The Scientists Flashcards
Law of Conservations of Matter (Mass)
Scientist: Democritus (Lavoisier) 1794
DEFINITION: Law of Conservations of Matter (Mass)
mass is either created or destroyed
Total mass of products = total mass of reactions
Law of Definite Proportions
Scientist: Proust 1799
DEFINITION: Law of Definite Proportions
A chemical compound same elements in the same proportions of mass
Law of Multiple Proportions
Scientist: John Dalton 1803
DEFINITION: Law of Multiple Proportions
When two or more different compounds are composed of the same two elements then the ratio of masses of the second element with a fixed mass of the first element is always a ratio of small #.
Dalton’s Atomic Theory
Scientist: John Dalton 1803
DEFINITION: Dalton’s Atomic Theory
All matter is composed of elements/ atoms that are diff. elements combine in simple whole # ratios to form chemical compounds/ In chemical rxs, atoms are separated, rearranged, or composed
Quantum Theory
Scientist: Heisenberg, Schrodinger, Bohr & others 1926
DEFINITION: Quantum Theory
mathematically describes the wave properties of electrons
1/5 Model
Billiard Ball Model ( Democritus 1803)
- tiny
- solid
- Indestructible particles
2/5 Model
Plum Pudding Model ( J.J. Thomson 1904)
- solid sphere
-w. negative charge electrons embedded in it
3/5 Model
The Rutherford model (Earnest Rutherford 1909)
- atom very tiny
- positively charged
- dense center
- mostly empty space
4/5 Model
The Bohr’s model/ Planetary Model ( Niels Bohr 1913)
- fixed orbit
5/5 Model
The Quantum Mechanical Model of the Atom (Heinsberg, Schrodinger, Bohr, & others
