1. Sir James Chadwick & his Contribution to Science
Annalise S.
Lydia V.
Eddie R.

2. 1911 Rutherford 1897 Thomson 1913 Bohr 1932 Chadwick 1926 Schrödinger
-He shot alpha particles through gold foil; some bounced back
- Introduced nucleus
-Quantum mechanics
-introduces subshells
-”shells” are actually “orbitals”
1897
Thomson
-Plum Pudding Model
-introduces protons & electrons
1913
Bohr
-Basis for our modern atomic model
- Introduced electron shells
1932
Chadwick
-introduced neutrons
-lead to invention of atomic bombs
1926
Schrödinger

3. What Lead to a Change in the Previous Model
Chadwick questioned how the believed theory (electrons were bound in the nucleus to cancel the charge of protons) was possible.

4. Previous Model
the atom was believed to be composed of a positively charged nucleus surrounded by negatively charged electrons

5. The Experiment
bombarded beryllium atoms with alpha particles and an unknown radiation was produced
Chadwick interpreted this radiation as being composed of particles with a neutral electrical charge and the approximate mass of a proton
He used scattered data to calculate the mass of this neutral particle
He called this a neutron

6. New
Model
the atom is now believed to have neutrally charged particles called neutrons which add to atomic mass

7. Neato Thingos His hobbies included gardening and fishing
Worked on Manhattan Project by the name of James Chaffee
Absolute legend Jimmy Neutron was named in his honour
During World War I, he was a prisoner of war in the Zivilgefangenenlager, Ruhleben, Germany
Without him, the atomic bomb would not exist
Neato Thingos