P1 Radioactivity
An atom is made from a nucleus surrounded by electrons. The nucleus contains protons and neutrons. Isotopes are atoms that have the same number of protons, but different numbers of neutrons.
An early model of the atom was the plum pudding model. It was disproved by Rutherford's scattering experiment and replaced by the nuclear model.
Most background radiation comes from natural sources, while most artificial radiation comes from medical examinations, such as x-ray photographs.
Radiation can damage cells and make them cancerous.
Radiation also has many practical uses. It can be used in medicine to trace where certain chemicals collect in the body, and also in industry, to control measuring equipment.
An early model of the atom was the plum pudding model. It was disproved by Rutherford's scattering experiment and replaced by the nuclear model.
Most background radiation comes from natural sources, while most artificial radiation comes from medical examinations, such as x-ray photographs.
Radiation can damage cells and make them cancerous.
Radiation also has many practical uses. It can be used in medicine to trace where certain chemicals collect in the body, and also in industry, to control measuring equipment.
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