Which element is more unstable?
Francium is the most unstable element that occurs naturally. The longest-lived isotope of francium, francium-223 has a half-life of only 22 minutes. There are other synthetic chemical elements that have a half-life lesser than francium-223.
Why is Tc 99 unstable?
Technetium can only be produced artificially because most forms or isotopes of it (atoms of the same chemical element with different numbers of neutrons) have an excess of neutrons, making it very unstable.
Is vanadium 51 stable?
Vanadium-51 is the stable isotope of vanadium with relative atomic mass 50.943964, 99.8 atom percent natural abundance and nuclear spin 7/2. A metallic element with the atomic symbol V, atomic number 23, and atomic weight 50.94. It is used in the manufacture of vanadium steel.
Is helium stable or unstable?
Helium atoms, on the other hand, have two protons and two electrons in the lowest energy level. The lowest energy level is filled with its maximum number of electrons. This is a very stable arrangement, and helium in consequence is an inert gas with few chemical properties.
Is Selenium stable or unstable?
Selenium is a metalloid (an element intermediate in properties between the metals and the nonmetals). The gray, metallic form of the element is the most stable under ordinary conditions; this form has the unusual property of greatly increasing in electrical conductivity when exposed to light.
Where is V found?
Vanadium is the fifth most abundant transition metal in the earth’s crust, often found with titanium and iron in their ores, and significant concentrations are found in certain coal and oil deposits, such as crude and shale oils.
What determines whether an element is stable or unstable?
Those that lie below the line of stability contain too many protons to be stable and are called “proton rich”. In summary it is the balance of protons and neutrons in a nucleus which determines whether a nucleus will be stable or unstable.
Which element are the most unstable?
Francium is one of the most unstable of the naturally occurring elements: its longest-lived isotope, francium-223, has a half-life of only 22 minutes.
What are stable and unstable elements?
Stable elements are those which have atleast one isotope with no tendency to “decay”, i.e., change into another element. They may have naturally-occurring unstable isotopes, such as Carbon (common C-12 is stable, natural C-14 is unstable). Unstable elements are those which have only unstable isotopes, such as Uranium.
Are most elements stable or unstable?
Stable elements are those that are unlikely to react with other elements, and unstable are those that are highly reactive. Stable elements are the noble gases (full outer shell – won’t bond with others).