The fast moving postively charged particles of radioactivity that were directed at the foil.
What are alpha particles?
Thomson used a ________ _________ _______to discover the first subatomic particle.
What is a cathode ray tube?
The reason Democritus's model was not as accepted as Dalton's model.
What is lack of scientific experimental evidence?
Compounds have fixed ____________.
What are compositions? Or ratios of atoms?
Name of the model of Thomson's atomic theory
What is plum pudding?
The positively charged particles sometimes were deflected in Rutherford's experiment because they were repelled by the _________.
What is postively charged nucleus?
Only certain energies for electrons are possible (i.e. energy is not a continuum) because the energy was ____________________. (Think of the wonky ladder.)
What is quantized?
The concept that Democritus contributed to our understanding of atoms.
What is there is a fundamental building block of matter?
The glowing beam of light in this experiment was attracted to (positive/negative) plate.
What is positive?
Describe Rutherford's hypothesis based on Thomson's atomic model.
The particles would go through the gold foil.
An electron that moves from an outer orbit to one nearer the nucleus releases its excess energy as ____________.
What is light?
The four elements according to Aristotle
What are air, earth, fire and water?
True or False: (based on Dalton's theory) all atoms of the same element are exactly the same.
What is true?
Which model was the first to replace Thomson's model of the atom?
What is Rutherford's Nuclear model?
Rutherford theorized that most of the atom is _________________________.
What is empty space?
What is our current model of the atom? (It replaced the Bohr model which only worked for hydrogen.)
What is the Quantum Mechanical Model?