Atomic theory of MATTER Flashcards
Who argued that you could not divide matter into smaller pieces?
Eventually when cutting reach a single particle of matter it willno longer be cut again
Democirtus
What did democritus name the this singular particle
Atomos or atom
Who published the 4 postulates? And what model of atom was used during this time?
John Dalton
Solid sohere model
What are the 4 postulates
- All elements are made of atoms
2, all atoms of the same element are alike but different from atoms of any other elemen - Chemical reactions rearrange atoms but do not create, destroy or change atoms from one element to another
- Atoms are composed of atmos combined in whole-number ratios
Who found out that within the confines of the atom there is an electron? What experiment did he do and what model did he come up with?
Joseph John Thompson
Cathode ray tube
Plum pudding model
Who discovered that there is a nucleus in an atom containing protons and neutrons. What model did he come up with and what experiment did he conduct .
Ernest Rutherford
Nuclear model
Gold foil experiment
Qhat did Niel’s Bohr Hypothesized? And what model of the atom did he come up with?
He hypothesized electrons in an atom in circular orbits at high velocities around the nucleus, like planets orbiting around the sun.
-taht electrons could move around the nucleus on,y in fixed distances based on their energy level.
-planetary model.
The orbits or shells around the nucleus atom
Energy level
The movement of an electron from one energy level to another
Transititon
The lowest energy state of an electron in an atom
Ground state
Higher energy state than the groun state
Excuted state
The minimum amount of energy absorbed or released by matter.. it is distinct amount of energy
Ganutum
Said to be the finger print of an element?
The line spectrum
What form does energy released by the electron take?
Electromagnetic radiation
