Subatomic Particles

• Subatomic particles of an atom are protons, neutrons, and electrons
• Protons are positively charged
• Neutrons are neutrally charged
• Electrons are negatively charged
• John Dalton was the first to describe an atom as a solid sphere in the 19th century
• J.J. Thompson conducted the cathode ray experiment in 1897. DURING HIS EXPERIMENT HE FOUND OUT ATOMS HAD NEGATIVELY CHARGED PARTICLES WHICH NOW WE KNOW AS ELECTRONS.
• Ernest Rutherford created the nuclear model in the 20th century. HE NAMED IT AFTER FINDING OUT THAT ATOMS HAD A NUCLEUS. USING THE GOLD FOIL EXPERIMENT, THE ALPHA PARTICLES REFLECTED FROM THE GOLD FOIL CONCLUDING THAT ATOMS HAVE A DENSE CENTER. HE ALSO FOUND OUT ABOUT PROTONS