chem 1:1 history if the models of the atom structure

Who described atoms as solid spheres

John Dalton

When was the electron discovered

1897

Who discovered the electron

JJ Thompson

What model was later created as a result of JJ Thompson descovery

Plum pudding

Who conducted the gold foil experiment

Ernest Rutherford

How was the gold foil experiment executed

Fired positively charged alpha particles at a very thin sheet of gold

What did the gold foil experiment reveal

unexpectedly most alpha particles passed through the gold meaning most of an atom must be empty space

What model was made as a result of the gold foil experiment

Nuclear model

Why was the nuclear model proved incorrect

Scientists realised clouds of electrons would quickly spiral down into the nucleus causing the atom to collapse

What was the next model after the nuclear model

Bohr model

According to bohrs model what happens to electrons when they emit or absorb electromagnetic radiation

Move between shells

Why was the Bohr model proved wrong

Scientists descovered not all electrons in a shell have the same energy

How was the Bohr model refined

Added subshells