History of the atom

What was the order of discovery of the proton neutron and electron

• electron

• proton

• neutron

What was JJ Thompsons theory

The plum pudding model

a general ball of positive charge with electrons stuck inside it

What was Rutherfords discovery

He fired alpha particles at a thin sheet of gold and some particles passed through however some were deflected leading to the conclusion that there is a compact nucleus with a positive charge

What was Bohr’s discovery

electrons orbit the nucleus in shells

what was chadwick’s discovery

the existence of neutrons within the nucleus