Atomic Models - 3.1.1.1

What was the first understanding of the atomic structure?

• John Dalton

• Atom was the smallest particle

What was the second understanding of the atomic structure?

• JJ Thompson

• Plum pudding model

• A ball of solid positive charge with negative electrons spread throughout

• Electrons

What was the third understanding of the atomic structure?

• Ernest Rutherford

• Nuclear model

• Atom has a tiny positive nucleus surrounded by mainly empty space in which electrons are moving

• The nucleus

• Electrons at gold foil - alpha particles deflected back

What was the fourth understanding of the atomic structure?

• Neils Bohr

• Nuclear model

• Atom has a tiny positive nucleus surrounded by mainly empty space in which electrons are moving in energy shells

• Electrons move in energy shells

What was the fifth understanding of the atomic structure?

• James Chadwick

• Nuclear model

• Atom has a tiny positive nucleus containing protons and neutrons, surrounded by empty space with electrons moving in shells

• Protons in the nucleus