jun 21, 1911 - Ernest Rutherford - Discovery of Nucleus and Planetary Model (1911)
Description:
Rutherford is credited for the discovery of the dense core of an atom called a nucleus. The nucleus itself consisted of positively charged particles known as protons. He stated that electrons orbited around the nucleus, like planets orbiting the sun, hence the model is referred to as the "Planetary Model",Added to timeline:
Date:
jun 21, 1911
Now
~ 115 years ago