Science Test - Oct. 18 Flashcards
What was Democritus’s theory
All things in the universe were made up of tiny unbreakable things
What was Arisotle’s theory
He opposed the atomic theory. He believed matter was made up of tiny particles that were each made up of either water, fire, earth, or air
What was Dalton’s theory
Matter is made up of tiny invisible particles called atoms and each element has its own kind of atom with own particular mass
What was Thomson’s theory
Atoms are positive spheres that are embedded with negitive electrons (raisen bun)
What was Rutherford’s theory
Atoms have a small positive neucleus, which is surrounded by mostly empty space and rapidly moving electrons (gold foil)
What was Neils Bohr’s theory
Electrons move around the nucleus in energy levels
What was Chadwick’s theory
The neutron
What is the order of theorists
Democritus, Aristotle, Dalton, J.J Thomson, Ernest Rutherford, Neils Bohr, James Chadwick
Define the term model
A physical, conceptual, or mathematical representation of a system
Where is most of the mass of the atom found
The nucleus
How is the proton charged
Positive
How is the neutron charged
Neutral
How is the electron charged
Negitive
Where is the electron
Surrounding the neucleus
Where is the proton
In the neucleus
