1 - Fundamental particles Flashcards
In 1661, Robert Boyle discovered…
elements
In 1803, John Dalton discovered…
atoms
In 1897, JJ Thompson discovered…
electrons
In 1909, Ernest Rutherford discovered…
the positively charged nucleus
- suggested a new model called the “nuclear model”
In 1913, Niels Bohr discovered…
that electrons orbit the nucleus in shells
- led to the new model, the “quantum atomic model”
In 1932, James Chadwick discovered…
evidence for the existence of particles in the nucleus with mass but no charge
- these particles are called neutrons
What is the relative charge and relative mass of a proton?
charge: +1
mass: 1
What is the relative charge and relative mass of a neutron?
charge: 0
mass: 1
What is the relative charge and relative mass of a electron?
charge: -1
mass: 1/1836
An atom consists of…
a nucleus containing protons and neutrons surrounded by electrons
