Creating a Timeline story of Matter that shows when the key ideas wereproposed and who proposed them Start your timeline at 8000 B.C and add to it as you read through the subsections. Read pages 113-120 of your text
For each idea, be sure to include the observations the person made that led to the new theory.
1597 Andreas Libau first chemistry text ever printed (how to prepare some chemicals)
1660’s Boyle experimented with the behavior of gases; interested in determining the composition of gases and other substances.
-negative electrons balance te positive sphere – so had no charge
- Nagaoka’s model showed the atom as a positive sphere around which electrons orbited in a ring
1909 Rutherford – Proposed atoms were mainly empty space (positive particles could pass) but at the core a tiny positive nucleus
Bohr’s Model - Electrons do not orbit randomly, move in circular orbits (Electon shells)
-electrons jumped between by gaining and losing energy
Chadwick - nucleus contained positively charged particles called protons and neutral particles called Neutrons
Today’s quantum mechanics model describes the atom as a cloud of electrons surrounding a nucleus