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What major contribution did Rutherford provide to the Atomic Theory?
Discovered that atoms have a positive charge in the core (nucleus) and a negative charge outside the core, and that atoms are mostly empty space
Repel
Who conducted the gold foil experiment?
Ernest Rutherford
What major contributor did Thomson add to the Atomic Theory?
Discovered that atoms can be split into smaller particles (protons and electrons)
Who developed the “plum pudding” model of an atom?
J.J. Thomson
What does the “plum pudding” model show?
An atom is a ball of positively charged material with negatively charged particles floating inside (like plums In English pudding).
What did Lavoisier contribute toward the Atomic Theory?
Proposed the Law of Conservation of Matter, and created the metric system
What does the Law of Conservation of Matter State?
- Atoms of the same element are exactly alike.
- Atoms if different elements are different.
- Atoms can join with other atoms to make new substances
What was Bohr’s contribution to the Atomic Theory?
Electrons travel around the nucleus of an atom in definite paths, like the planet rotates the sun. Electrons can jump from one energy level (path) to another
What was Schrodinger’s contribution to the Atomic Theory?
The exact location of an electron can not be found. Electrons travel in electron clouds which represent where the electron is likely to be found.
What was Chadwick’s contribution to the Atomic Theory?
Discovered the existence of neutrons. He found that the Atomic mass of most elements is double the number of protons for one atom of that element
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