If, on the other hand, actinium was always associated with uranium and radium, then its effects would be submerged in those of the much more potent effects of the uranium series of elements.
The actiniumis present in negligibly small amounts.
For if actinium was an independent element we would be sure to find actinium haloes.
The absence of actinium haloes clearly supports this view.
On Rutherford's theory then, actinium should always accompany uranium and radium, but in very subordinate amount.
These are generally known as radium emanation, thorium emanation, and actinium emanation.
The end product of the actinium series is also an element resembling lead, but both the beginning and ending of this series are still in obscurity.
There are three series by which naturally radioactive nuclei decay to stable ones: The Uranium Series, the Thorium Series, and the Actinium Series.
Separating a quantity of actiniumfrom a kilogramme of ore, Boltwood observed a growth of 8.
We may therefore insert provisionally actinium and its series of derivatives between uranium and radium in the radio-active pedigree.
Evidence gradually accumulated that the amounts of actinium in radio-active minerals were, roughly at any rate, proportional to the amounts of uranium.
What is the final non-active product of the series of changes we have traced from uranium through actinium and radium?
He also studied “thorium B” in the thorium radioactive series and “actinium B” in the actinium radioactive series.
Still a third element, actinium (atomic number 89) was, at that time, the first known member of a series that also ended in lead.
It was ²³⁵U, notactinium itself, that was the beginning of the actinium radioactive series.
The uranium series, the thorium series, and the actinium series all ended in lead.
Bodies which contain actiniumare particularly rich in emanations.
Since the above was written, another product has been found to intervene between the X substance and the emanation in the case of actinium and thorium.
Footnote 38: An actinium X was also discovered by Professor Giesel (Jahrbuch d.
They have been named radio-actinium and radio-thorium respectively.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "actinium" in a variety of sentences. We hope that you will now be able to make sentences using this word.
