The atomic theory has been revised over time .. j. j thompson described the atom as having a mix of positive and negative charges randomly scattered throughout a sphere of space ruthford's experiments proved this model incorrect and developed the model with a tiny positively charged nucleus .. today, the model is more complex posting a cloud of electrons around a nucleus of protons and neutrons. why has the atomic theory changed during the last several hundred years.
a the splitting of the first atom created the need for a new model
b modern scientific methods are more reliable in developing theories
c the atom has changed over time and the model reflects those changes
d as new discoveries are made existing theories are revising or replaced