Radioactivity and Nuclear Energy

Radioactive Decay Nuclear Transformations Detection of Radioactivity and the Concept of Half-life Dating by Radioactivity Medical Applications of Radioactivity Nuclear Energy Nuclear Fission Nuclear Reactors Nuclear Fusion 

Computer simulation of a 1 5 solar mass star exploding as a supernova. 

The nucleus is believed to be made of particles called nucleons (neutrons and protons). 

Recall from Chapter 4 that the number of protons in a nucleus is called the atomic number (Z) and that the sum of the numbers of neutrons and protons is the mass number (A). Atoms that have identical atomic numbers but different mass numbers are called isotopes. The general term nuclide is applied to each unique atom, and we represent it as follows  

The atomic number (Z) represents the number of protons in a nucleus the mass number (A) represents the sum of the numbers of protons and neutrons in a nucleus. 

Wooden artifacts such as this dragon figurehead from a Viking ship can be dated from their carbon-14 content. 

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