Atomic+Theory+ICS17AltaA

Summary
 * Scientific inquiry were used a lot to update the atomic theory. For example, Ernest Rutherford, challenged Thomson's model. Therefore, he did an experiment and inferred that an atom is mostly empty space, and has a positive center, which he called a nucleus. Another example is the Thomson's theory. The Thomson's theory involved an observation and discovered the electron, which is a negative charge in an atom.