Radioactivity is a term that refers to the emissions from atomic nuclei due to changes in those nuclei. Those changes will occur as a result of instability of isotopes of certain elements. These atoms have a nuclear structure that is inherently unstable for whatever reason. And any unstable nucleus will eventually decay in a manner characteristic of that particular atom (radioisotope). We term the activity associated with the natural changes due to nuclear instability radioactive decay. As you can guess, different things might appear as an expression of the radioactivity of a radioisotope, and they'll vary according to the radioisotope being inspected.
We could say that the elements on the upper end of the Periodic Table are radioactive, and these elements, the ones beginning with bismuth, have no nuclear configurations that permit them to avoid instability and their eventual radioactive decay. Additionally, we know that there are isotopes of other elements (lighter ones) that are not stable, and these radioisotopes are radioactive and will decay in time. Lastly, there are the elements technetium and promethium, which are the only elements with atomic numbers below that of bismuth that have no stable isotopes.
The emissions we might gather under the umbrella of radioactivity include both particulate radiation and radiation in the form of energy, or electromagnetic radiation. Your investigation of the instabilities associated with atomic structure and what it is that results is just beginning. Use the links below to check facts and learn more.
That means that atoms of a substance will decay, or disintegrate, and convert to some other type of atom (other element).
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Uranium becomes lead
You can only say, 23 years later, I-131's radioactivity almost decreases to 1/8 of original radioactivity.
Radioactivity is caused by unstable atoms, that break apart.
Radioactive decay is the characteristics of radioactive substances that all radioactive atoms do not disintegrate at once but do so gradually .It is spontaneous and it is not influenced by external conditions such as temperature, pressure , etc.. In any radioactive decay , either an alpha particle or beta particle is emitted by atom .Both the particles are not emitted simultaneously .Moreover , the atom does not emit more than one alpha particle or more than one beta particle at a time
a definition
True and False. Radioactivity is a characteristic of unstable atomic nuclei, whereas radioactive decay is the process that a radioactive nucleus undergoes when it decays due to its instability.Argument for true: Radioactivity is the tendency to undergo radioactive decay.Argument for false: The two terms are unrelated because one is a characteristic and the other is a process, and, therefore, the question misunderstands the definition of the terms.You choose your definition. This writer prefers false.
The time taken for the radioactivity to halve its intensity, starting from any arbitrarily chosen instant.
Radioactivity affect the water molecules. Radioactivity makes it harmful
What other sort of radioactivity is there?
For example natural and artificial radioactivity.
Radioactivity can be induced in ordinary matter by artificial transmutation.
You cannot measure radioactivity in litres
Radioactivity in Japan is about 15,000 terabecquerels.
Human + A lot of radioactivity = Dead
Artifical radioactivity
no but she built the knowleage of radioactivity.