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nucleus,in physics, the extremely dense central core of an atom.

The Nature of the Nucleus Composition Atomic nuclei are composed of two types of particles, protons and neutrons, which are collectively known as nucleons......

actinide series,a series of radioactive metallic elements in Group 3 of the periodic table.

Members of the series are often called actinides, although actinium (at. 89) is not always considered a member of the series......

This molecule behaves in almost the same way as a normal molecule of water.

The formula for the fraction remaining is one-half raised to the power given by the number of years divided by the half-life (in other words raised to a power equal to the number of half-lives).Radioactive tracers are substances that contain a radioactive atom to allow easier detection and measurement.(Radioactivity is the property possessed by some elements of spontaneously emitting energy in the form of particles or waves by disintegration of their atomic nuclei.) For example, it is possible to make a molecule of water in which one of the two hydrogen atoms is a radioactive tritium (hydrogen-3) atom.One application for the tracer molecule described above would be to monitor plant growth by watering plants with it.The plants would take up the water and use it in leaves, roots, stems, flowers, and other parts in the same way it does with normal water.In radioactive atoms the nucleus will spontaneously change into another type of nucleus.