To calculate the percent
of the radioactive isotope rhenium after 3 half-lives is
(1/2)^3 = 0.125 x 100 =
12.5%
We calculate that there
is 12.5% percent activity of the radioactive isotope.
<span>Radioactive isotope
other called as radioisotope, radioactive nuclide or radionuclide, in any of
the several species of the same chemical element with different masses whose
nuclei are unstable and dissipate excess energy by spontaneously emitting
radiation in the form of gamma, alpha and beta rays. Rhenium is a chemical element
and has an atomic number of 75. Its chemical symbol is Re. It is in the
third-row transition metal in group 7 of the periodic table.</span>
The choices for this question are N2, O2 and H2O. I believe the closest correct answer would be N2. H2O would have the strongest one as it is capable of hydrogen bonding which is one strong intermolecular force. To compare oxygen and nitrogen, we look at properties of both substances. Oxygen would have a higher boiling point than nitrogen which means oxygen would require more energy to allow phase transition so it should have a stronger force than nitrogen. Thus, nitrogen would have the weakest intermolecular force.
Answer:
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Explanation:
Geological activity determines geological structures. The prevalent types and forms of tectonic working in a place will control the form of structure that can be found in a terrain.
- In volcanic region, it is common to see volcanic structures of different types such as calderas, strato-volcano etc. These structures are formed by the volcanic activities.
- Also, in a karst topography, we find sink holes, stalactites and stalagmites etc. due to the nature of the geologic activities going on.
- Some sedimentary rocks shows cross bedding due to the environment where they form.
So, geologic activities controls the structure found in an area