This is the year in which Soddy discovered half-life and isotopes (within 5 years)
What is 1900?
100
In 1932, Chadwick discovered this in the nucleus.
What is the neutron?
100
This is the antimatter counterpart of the electron which was discovered by Carl Davis Anderson in 1932.
What is a Positron?
200
In 1900, JJ Thompson described the atomic model as a "sphere of positively material with negatively charged electron buried within". This model was also known as The __________ Model.
What is Plumb Pudding?
200
In 1940, Neils Bohr described the atomic model as a central nucleus containing protons and neutrons with electrons flying around the nucleus in imaginary _______.
What is orbits?
200
The Antiproton, which was discovered in 1955, is the animatter counterpart of this particle.
What is antiproton?
300
Ernest Rutherford established in 1911 that the nucleus of an atom is positively charged and very _____.
What is Dense?
300
In 1964, Murray Gell-Mann and George Zweig propose a theory about these, which are the building blocks of all particles.
What are quarks?
300
The Antineutrino, which was discovered in 1956, is the animatter counterpart of this particle.
What is Neutron?
400
In 1914, Rutherford suggests the possibility of ______ in the nucleus.
What are protons?
400
Between 1970-73, the standard model of _____ physics was developed. This describes dozens of particles and their interactions with each other.
What is Particle Physics?
500
The existence of protons was established in this year. (Within 5)
What is 1919?
500
In 2012, this particle, known as the "God Particle" was discovered. It helps explain why particles have mass.