Unit 7.1-7.2

Unit 7.1-7.2 - Unit 7.1 Radioactivity spontaneous emission...

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Unit 7.1 Radioactivity: spontaneous emission of radiation from certain unstable elements The nucleus of an atom contains neutrons and protons and are collectively referred to as nucleons Atoms of a given element all have the same number of protons (atomic number) but different isotopes have different numbers of neutrons. Isotopes are distinguished by their mass numbers (total number of nucleons) Radioactive nuclei are called radionuclides. Atoms containing radionuclides are called radioisotopes Radionucldes spontaneously decy by emitting particles and electromagnetic radiation (radioactivity) Types of Radioactivity Decay o Alpha 2 protons lost, making atomic number decrease 2 o Beta 1 electron lost, making atomic number increase 1 o Gamma No mass or charge change o Positron 1 proton lost, making atomic number decrease 1 How Chemical and Nuclear Reactions differ: o In chemical reactions, only outer electrons are involved, in nuclear reactions, mainly protons and neutrons are involved o Chemical reactions are affected by temperature, but not nuclear reactions o In chemical reactions, mass is conserved, but not in nuclear reactions Beta-Decay
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Unit 7.1-7.2 - Unit 7.1 Radioactivity spontaneous emission...

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