the atom Flashcards
daltons atom model
solid sphere that could not be divided further
limitations of daltons atom model
no protons, neutrons or electrons
who created the plum pudding model
J.J Thompsom
what did the plum pudding model look like
cloud of positive charge with negative electrons imbedded in it
limitations of plum pudding model
no protons or neutrons
how did scientists discover that atoms had a nucleus
alpha scattering experiments
OR
gold foil experiment
what did niels bohr discover
electrons were at fixed distances
shells / energy levels
who discovered the neutron
james chadwick
who discovered the proton
ernest rutherford
what is the relative atomic mass
average mass of all the atoms of an element
where are the protons and neutrons
nucleus
how do you calculate number of neutrons in an atom
mass number - atomic number
isotope
c
element
substance made up of 1 type of atom
5 physical processes to separate mixtures
filtration
crystallisation
simple distillation
fractional distillation
chromatography
