What is the definition mass number
The total number of protons and neutrons in an atom
What is the definition of atomic number
The number of protons in an atom
What is an isotope
An atom of the same element having different number of neutrons
Describe the development of the model of the atom
Describe the development of the model of the atom
Plum pudding - suggested that the atom is a ball of positive charge with negative electrons embedded in
Alpha particle scattering - led to the conclusion that the mass of an atom was concentrated at the centre and that the nucleus was charged
Bohr - suggested that electrons orbit the nucleus
What was the evidence from the alpha scattering experiment that led to the change in the atomic model
What is radioactive decay
When a nucleus gives out radiation as it changes to become more stable and its random
What are the 4 particles that can be emitted by nuclear radiation
Alpha
Beta
Gamma
Neutron
What is the penetrating power, range in air, and ionising power of alpha, beta, and gamma particles
What are the uses of the different nuclear radiations
What is the definition of half-life
Is the time taken for the number of nuclei of the isotope in a sample to half
What is radioactive contamination
radioactive contamination is the unwanted presence of materials containing radioactive atoms on other materials
What is irradiation
Irradiation is the process of exposing an object to nuclear radiation
Name some sources of background radiation
Rocks, cosmic rays, nuclear weapons, nuclear accidents
Explain how radiation is used for exploration of internal organs and control or destruction of unwanted tissue
Explain how nuclear fission works
Explain how nuclear fusion works and how a chain reaction may occur
