Question

1. john daltons atomic theory proposed that all elements are composed of indivisible particles called
2. according to dalton, atoms of the same element are identical in their mass and
3. j.j. thomson conducted an experiment using a cathode - ray tube. what did this experiment primarily demonstrate the existence of?
4. in thomsons model of the atom, negatively charged particles were embedded within a positively charged substance. this model is often referred to as the:

a) nuclear model b) planetary model c) plum pudding model d) bohr model

1. ernest rutherfords gold foil experiment involved firing what type of particles at a thin sheet of gold?

Explanation:

1. John Dalton proposed atoms as the indivisible particles of elements.
2. Dalton thought atoms of the same element had identical mass and properties.
3. J.J. Thomson's cathode - ray tube experiment showed the existence of electrons.
4. Thomson's model with negative particles in a positive substance is the plum - pudding model.
5. Rutherford's gold foil experiment used alpha particles.

Answer:

1. atoms
2. properties
3. electrons
4. c) Plum pudding model
5. alpha particles