Half lives can be any length, from a few milliseconds to millions of years.
It is the time in which a number of unstable isotope nuclei reduces to half its original number.
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The life of an isotope depends on whether it is stable or not. Stable isotopes do not decay and therefore, do not have an lifetime since they do not go away. Unstable isotopes decay at predictable rates. However, each unstable isotope decays at a its own rate. Therefore, the life of an unstable isotope depends on the isotope in question. Some isotopes have extremely short lifetimes (milliseconds) and other have extremely long lifetimes (billions of years).
Radioactivity
radioactive decay or simply decay.
Many elements decay fast. All the elements after 92 are man made and decay, and all the ones over 104 decay rapidly, some with a half-life in the millionths of a second. Element 118, ununoctium, has a half-life of 0.89 mili-seconds.
Isotopes of elements with unstable nucleus release nuclear radiation. Generally theinstabilityis related to the neutron to proton ratio in the nucleus of an atom.
The life of an isotope depends on whether it is stable or not. Stable isotopes do not decay and therefore, do not have an lifetime since they do not go away. Unstable isotopes decay at predictable rates. However, each unstable isotope decays at a its own rate. Therefore, the life of an unstable isotope depends on the isotope in question. Some isotopes have extremely short lifetimes (milliseconds) and other have extremely long lifetimes (billions of years).
Unstable isotopes can be chemically reactive.
Unstable isotopes are radioactive isotopes, can disintegrate and emit radiations.
Hydrogen has 1 unstable isotope, and 2 stable isotopes.
Unstable isotopes can spontaneously undergo changes, transforming them into other isotopes of the same or of different elements. Stable isotopes do not. Some isotopes are very unstable and exist for less than a second; others can exist for billions of years but still be unstable. Many elements consist of more than one isotope. One or more of these isotopes may be unstable. In isotopes of an element, the nucleus contains different numbers of neutrons while the number of protons remains the same and determines how the atom behaves chemically. There are several types of instability (too few neutrons, too many neutrons) and several types of decay.
Not all isotopes are unstable. But now more than 3 000 unstable isotopes are known, artificial or natural.
All the isotopes of americium are radioactive and unstable.
These isotopes are unstable and emit radiation.
Not all isotopes are radioactive; the radioactive isotopes are unstable and emit radiations.
Mercury has isotopes ranging from an atomic mass of 171 to 210. Of these, only 7 are stable and a further 5 have halflives longer than a halfday. The radioactive isotopes are: 171 to 195, 197, 205 to 210. Two of the stable isotopes also have unstable excited forms.
Some isotopes are stable, others are unstable.
These isotopes are unstable and disintegrate emitting radiations.