# data[].attributes.body
Heisenberg showed that it was impossible to determine the exact position and speed of electrons as they moved around an atom. The idea that electrons can not be pinpointed exactly but instead exist within a range of possible locations gave rise to the quantum model of the atom.

# data[].attributes.body
Bohr stipulated that electrons orbit the nucleus at fixed energies and distances. They are able to jump from one level to another, but not exist in the space between the levels. His theory was then opposed when other theorists stated that rather moving as discreate particles, the electrons behaved like waves and not being fixed in a particular point in space.

# data[].attributes.body
Ernest Rutherford became the father o the nuclear age. He decided to study atoms more closely by shooting small positively charged alpha particles at a sheet of gold foil. Rutherford concluded that atoms consisted largely of empty space with just a few electrons and most of the mass at the center. He then called this concentrated mass the nucleus. The alpha particles pass through but end up bouncing back off of the dense and positively charged nucleus.

# data[].attributes.body
In 1897 physicist J.J Thompson discovered the electron. He showed atoms as uniformly packed spheres of positive matter filled with negatively charged electrons.

# data[].attributes.body
Dalton showed that substances always broke down into the same elements and in the same proportions. He eventually concluded that the various compounds were combinations of atoms, of different elements. Each had a particular size and mass that could neither be created or destroyed.