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Atom 460 B.C.
-Democritus a Greek philosopher discover it around 460 B.C.
-kept breaking a eice of matter in half till it couldn be broken anymore which is the atom.
-his ideas had no lasting effects on Greek philosopher. -
Period: to
The discover period
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JJ Thompson in 1897 Electrons
JJ Thompson discovered that atoms have electrons, he thought matter must have a positive charge. His models looked like raisins stuck on the surface of a lump of pudding
-other non-related things going on in the US
the LEAP year was enforced. and the 2nd modern olympics takes place in Paris. -
Different Energy Levels
Ernest Rutherford discovered that there were different energy levels outside of the nucleus and that the first holds the least and the last holds the most electrons.
-other non-related things going on in the US
Chevrolet enter the automobile market && and ground breaks for Fenway Park. -
Orbitals outside the nucleus Neils Bohr
Neils Bohr discovered that electrons move in discrete patterns called orbitals in 1913, by observing the patterns in the Spectra lines.He proposed that electrons travel only in certain sucessively larger orbits. he suggested that the outer orbits could hold more electrons and the inner ones less.
-other things going on at the time
16th amendment was ratified ad the 2nd Balkan war began. -
Nucleus Ernest Rutherford
Ernest Rutherford had a long career in atomic physics, in which he taught many other famous physists. The nucleus holds most mass of the atoms.
- He beamed alpha particles at a thing sheet of gold foil, during the experiment most of the particles passed through the gold foil onto the screen behind it, but some were deflected. -
Protons and Neutrons James Chadwick
James Chadwick discovered that there are both protons and neutrons in an atom by using radiation and the gamma ray hypothesis.
-other non-related things going on at the time:
Babe Ruth made his famous called shot that October.
