Ch. 2 Structure of the Atom Flashcards
the idea that electromagnetic radiation exhibits properties of both a wave and a particle is called
wave-particle duality
value of the speed of light
3x10^8 m/s; 186,000 miles/sec
positively charged beta particle
positron
value of planks constant
4.135x10^-15 eV sec; 6.626x10^-34 J sec
developed the electromagnetic theory
James Maxwell
what is difference in mass called
mass defect
filament electron gets attracted to the nucleus and breaks or slows down and changes direction, resultant loss of energy creates what kind of photon
Brehms
atomic mass number symbol
A superscript
what are neutrons and protons held together in the nucleus by
nuclear binding energy
a molecule that contains at least 2 different elements
compound
atomic number symbol
Z subscript
different atomic structures absorb differently known as
differential absorption
electron from filament electron stream knocks out the k-shell electron from the Tungsten
characteristic radiation
the reason we filter is due to what
brehms photons
what is the very last shell in an atom called
valence shell
formula to determine max number of electrons that will fit in an electron shell
2n^2
the ebe of the k-shell electron of Tungsten
69.5 keV
what are electrons held in their orbits by
electron binding energy
provided one of the most detailed and elaborate theories; credited with expanding and formalizing the earliest atomic theory
Democritus of Abdera
discovered the electron and described the atom as a positive charged sphere with negatively charged electrons embedded in it
Joseph John (J.J) Thomson
who organized the known elements into the periodic table
Dmitri mendeleev
describes the atom as having 3 fundamental components - electron, proton, and neutron; brought us to the theory and model of the atom we are most familiar with
Niels Bohr
Created a model of the atom which resembled a tiny version of our solar system; experimented with scatter radiation
Ernest Rutherford
developed atomic theory based on scientific evidence; recognized that elements combine in definite proportions to form compounds; theorized compounds were formed from molecules, molecules by fixed ratios of constituent atom types, also that chemical reactions were a rearrangement of atoms
John Dalton
