Atomic Models Flashcards
English chemist and physicist known for being color blind and for converting atomic philosophy into atomic chemistry.
Hi
John Dalton
State Dalton’s atomic theory (C,IR,MA,SWN)
All matter is composed of atoms, Atoms are indestructable and resist change, Elements are characterized by their mass and atoms, Atoms combine in small whole number ratios to form molecules
British scientist known for the cathode ray tube experiment, which disproved Dalton’s atomic model of a solid, indestructible sphere.
JJ thomson
says that like
charges repel, and opposite charges attract.
Fundamental Law of Electrostatics
It was a series of experiments that discovered the electron and its properties.
Cathode Ray Experiment
Conclusion of CRT
Cathode rays are made of electrons, Electrons are over 1,000x lighter than atoms, Electrons have the same mass no matter what
British physicist and former student of J.J. Thomson, known for the gold foil experiment
Ernest Rutherford
*Also known as Geiger-Marsden Experiment
Gold Foil Experiment
Because majority of alpha particles pass
through the gold foil, then most part of the atom
is
Empty
There must be a powerful force that causes the
deflection of alpha particles. This will be called
Nucleus
*Working with nitrogen molecules, Rutherford
later on discovered these positively-charged
particles in the nucleus, which are now called
Protons
Danish physicist and a leading figure in science, known for being the first to apply quantum concepts in atomic chemistry.
Neil bohr
*Bohr proposed that electrons’ energy are
Quantized
*Electrons are in a state called the ___ when they are stable
Ground state
*Electrons go back to their ground state from
excited state by
Releasing energy
*If electrons are removed from a neutral atom, the
result is a
Cation
*If electrons are added to a neutral atom, the
result is an
Anion
Cations are
Positive
Anions are
Negative
*In a neutral atom, the number of protons is
equal to the number of
Electrons
Z refers to
atomic number
are types of atoms of the same
element having the same atomic number but
different mass number.
Isotopes
Mass number formula
n + p
Atomic Symbol of the AZX
A/Z x
