Bk Ch 1 Discovery Of The Atom Quiz

Greek philosopher, namely Democritis, devised a theory that all matter is made of atoms.

JJ Thompson combined the idea of elements with the Greek theory that Democitris came up with.  It was called the Atomic Theory.

The Atomic Theory stated that 1) Matter is made of molecules.

The Atomic Theory stated that 2) Atoms can be divided into smaller pieces.

The Atomic Theory stated that 3) All atoms of an element are exactly alike.

The Atomic Theory stated that 4). Different elements are made of different atoms.

William Crookes used a cathode-ray tube which made a greenish glow.  Crookes at first thought it was something supernatural and then was convinced it was charged particles.

JJ Thompson revised Crookes experiment and used a magnet to attract the greenish glow.  He discovered that there were neutral charges in an atom.

JJ Thompson revised Dalton's model of the atom. Thompson's model looked like a sphere that was postively charged with negatively charged particles spread throughout.

Earnest Rutherford tested Thompson's model and found that it was inaccurate.

Rutherford's experiment proved that there was a small nucleus in the atom and that most of the atom was empty space.

After Rutherfords experiment, other scientists discovered that there must be electrons in the atom also because an atom's mass equalled more than just the mass of the protons.

Thompson was well known for trying to prove the existance of supernatural beings.

The current model of the atom was created by Neils Bohr.

The current model of an atom has an electron cloud surrounding the nucleus.