Which 3 subatomic particles make up an atom ?
What are the parts of an atom? Structure of an atom Nucleus – center or core which contains protons and neutrons Proton is a positively (+) charged particle in the nucleus Neutron is neutral. It has no charge. Electrons are very tiny particle that surround the nucleus and is negatively (-) charged Thomson’s model – first scientist to suggest an atom contains smaller particles. He discovered the negatively charged electrons. Rutherford’s model – discovered that the atom is mostly empty space and the protons are in the nucleus Bohr’s model – discovered that the electrons are arranged in different energy levels. Modern model is based on the finding of Thomson, Rutherford, and Bohr.
