2.1 History Of Atomic Theory Flashcards
1
Q
Democritus
A
Matter was indivisible
Smallest piece: atomos
2
Q
5 points in Dalton’s theory
A
Elements- extremely small particle Atoms cannot be created nor destroyed All matter made up of atoms Compounds are formed by a combo of 2 or more atoms Chemical reaction-rearrangement of atoms
3
Q
Thompson
A
Electron
4
Q
Rutherford
A
Atoms were mostly empty space with positive center, nucleus
5
Q
Rutherford said electrons were in or out of the nucleus
A
Outside
6
Q
Millikan
A
Found charge and mass of the electron using oil drop experiment
7
Q
Bohr
A
Planetary model believing that electrons travelled in a specific energy level around the nucleus
8
Q
Electron cloud model and today’s use
A
Assign electrons to different atomic orbital
Now the orbitals explain the pattern in the periodic table
9
Q
Flaws in Dalton’s theory
A
Indivisibility was proven wrong, atoms can be further subdivided.
Stated atoms of the same element are similar but actually some atoms of elements vary in mass and density.
