Activity 3: Atomic Models
A. How was the model of the atom changed throughout history? In this activity, you are
going to trace the development of the atomic model. Use the information in the cards
below in completing the timeline.
Card A
Atomic Model
Card B
Proponent
Billiard Ball Model
Quantum Mechanical Model
Nuclear Model
Planetary Model
Plum-Pudding Model
Joseph John Thomson
Neils Bohr
John Dalton
Ernest Rutherford
Erwin Schrodinger
Card C
Description
Electrons orbit the nucleus and these orbits have specific size and energy.
Matter is made of tiny particles which are indivisible and indestructible.
Atom is made of sphere of positive charges with negatively charged electron
embedded in it.
Electrons move around the nucleus in a cloud and not in orbits. Electrons exist in
specific energy levels.
Atoms are mainly empty space and mass is concentrated in the center of an atom,
called nucleus. Electrons are outside the nucleus​