atom models
First scientific model of the atom, said atoms were solid spheres was made by who
Dalton
positive particles in an atom
proton
who thought the 4 elements were earth, air, fire and water
Aristotle
the planetary model or the solid sphere model
sphere
an atom has an atomic number of 10 and a mass number of 20 how many electrons does it have
10
this model proposed after electrons were found said atoms were like plum pudding with electrons stuck in the positive atom and was proposed by
Thomson
particles not found in the nucleus
electrons
When an atom moves up a level it must gain what
energy
electron, proton or neutrons discovery
electron
what is given off when electrons go from an excited state to a ground state
light or energy
Rutherford came up with a model that had most of an atoms mass in a dense positive center
Nuclear model
particles with the same mass as a proton but no charge
neutron
what are outer energy level electrons, that are mostly responsible for atoms unique properties
valence electrons
Bohr's model or the nuclear model
nuclear
what particles are found in the nucleus
proton and neutron
current model of the atom, says we cannot know the exact location of electrons
electron cloud model
adding protons and neutrons for an element will tell you this
mass number
an element has 40 protons and a mass number of 89 how many neutrons does it have
49
the discovery of the nucleus or the electron
electron
in the electron cloud model electrons can be compared to what part of a fan
the blades
Model proposed by Bohr that tried to explain how electons could exist outside the nucleus
planetary model
atoms of the same element with a different number of neutrons than protons
isotopes
who gave atoms their name, when he gave them the Greek name for indivisible
Democritus
Rutherford's gold foil experiment or the plum pudding model
plum pudding model
can 2 atoms of the same element have a different number of protons
no