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Radioactive.
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Which alkali metal element has no stable isotopes?
Elements with no stable isotopes include technetium (element 43) and promethium (element 61) and all elements heavier than lead (elements 83 and higher). Bismuth, element 83, is virtually stable with an extremely long half life of 1.9 x 1019 years.
Why cant you add the average masses of each of the isotopes and divide to get overall average of the atoms?
Because the isotopes do not appear in equal amounts. This is hardly surprising since many isotopes experience radioactive decay and change to other elements after decay while stable isotopes persist - thus stable isotopes will usually dominate as the most common isotopes for individual elements with those with the longest half-lifes being more common than those with shorter half-lifes. Of course when you get into the heaviest elements there don't seem to be any stable isotopes so those with longest half life dominate.
Is erbium radioactive?
All erbium ordinarily found in nature is of stable isotopes. Like all other elements, erbium has synthetic radioactive isotopes.
What is the first radioactive element number?
Of elements that have no stable isotopes, technetium has the lowest atomic number, which is 43.
Find one element on the chart that has no stable isotopes?
Technetium, Promethium, and all elements heavier then Bismuth.
What is stable isotropes?
Stable isotopes of elements are called stable because they do not radioactively decay.
What is the slow breakdown of radioactive substances into more stable elements?
Radioactive elements break down in to stable isotopes through nuclear decay. The list of isotopes from a nuclear isotope to a stable isotope is called its decay chain.
Are iron elements stable?
Iron is an element, and there is only one element called iron (Fe). There are no iron element(s), but if you mean isotopes, then some iron isotopes are stable, and some aren't. No known element is stable in of it's isotopes.
All isotopes of this element are radioactive?
Radioactive Elements (38) These elements are radioactive. They either have no stable naturally occurring isotope, or else are entirely artificial (all artificial elements have no stable isotopes). by Andrew Moore
Is this a stable element Carbon atomic number 6?
It really isn't elements that are stable or unstable, but isotopes. Carbon has both stable and unstable isotopes.
Does argon have isotopes?
yes, all elements have isotopes. some stable, some radioactive.
Does every element has two stable isotopes?
No, Gold and several other elements have only one stable isotope, Promethium & Technetium as well as all elements heavier than Bismuth have no stable isotopes.
What are the stable elements of periodic table?
First, it should be noted that it is not an element that is stable or unstable, but an isotope. If you don't know the difference, please read the Wikipedia article, or some other source, about "isotopes", Most of the elements up to #82 (Pb) have stable isotopes, with the exception of #43 (Tc) and #61 (Pm). Please note that all of these "stable elements" also have unstable isotopes!
Which alkali metal element has no stable isotopes?
Elements with no stable isotopes include technetium (element 43) and promethium (element 61) and all elements heavier than lead (elements 83 and higher). Bismuth, element 83, is virtually stable with an extremely long half life of 1.9 x 1019 years.
Which elements is stable neon carbon boron or fluorine?
Of those, neon is the most chemically stable (least reactive).But for elements, the term stable usually means non-radioactive, and all of these elements have stable isotopes.
Do lanthinides contain radioactive elements?
Yes, promethium, which is a lanthanide, has no stable isotopes.
Is O radioactive?
If you mean oxygen: like most elements, it has both stable isotopes, and unstable (i.e., radioactive) isotopes. 16O, 17O and 18O are stable; the unstable (radioactive) isotopes include 15O and 14O.
