Atomic Theory Flashcards
atom comes from the Greek word__
atomos meaning indivisible
Democritus’ concept of the Atoms was rejected by Aristotle. he favoured ___ idea of ____
Empedocles’. four essential substances (earth, air, water, fire)
Alchemy lasted from 1st to 17th century A.D. what did alchemist search for? what contributions did they make?
elixir of life and the philosopher’s stone.
contribution to atomic theory was technological advances
___ suggested Atoms are solid spheres like BILLIARD BALLS
Dalton
flaw was it did not address how things acquire electrical energy
___ found that Atoms ARE divisible when he discovered the electron.
Proposed the PLUM PUDDING model
Thomson
flaw was there was no + charged particles. no Nucleus and electrons are stationary
who conducted the gold foil experiment? what did they find?
Rutherford
he found that the positive charges in an atom were not uniformly spread out but concentrated in the middle (nucleus)
Rutherford proposed the ___ model of the atom
nuclear or beehive
atom has very small heavy Nucleus Surrounded by electrons
most of the atom is empty space
Who said that electrons are found in fixed energy levels around the Nucleus like planetary orbits
Bohr
who discovered the neutron
Chadwick
schrödinger observed that electrons behaved like light. He suggested?
electrons do not orbit Atoms, but are found in spaces around the atom called ORBITALS
how many types of orbitals are there
4
each orbital orientation can hold 2 electrons. electrons will have opposite spins if in the same orbital. one clockwise the out her coubterclockwise. True or False
True
how many S
1
how many P
3
How many d
5
