1.1 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 nucleus and found that the nucleus is positively charged. He suggested a new model called the “nuclear model”.
In 1913, Niels Bohr discovered…
that electrons orbit the nucleus in shells. This 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 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.