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How many undecayed headsium nuclei would remain in a sample of 600 nuclei after three half-lives?
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Cs-137 is produced as a waste product in nuclear fission reactors What fraction remains undecayed after 241.84 years?
The half-life of Cs-137 is 30.08 years, so 0.0038 would remain after 241.84 years.
Why cells should remain small?
Not all calls are small. Slime molds for example have gigantic cells with tens of thousands of nuclei in each.
How can helium remain available for use on earth?
It is produced (slowly) by radioactive decay in the Earth's crust (Alpha radiation is helium nuclei). It doesn't react with anything, so when it escapes it remains in the air.
How long does it take to make uranium?
The isotope U-238 has a halflife of 4.5 billion years, roughly the current age of the earth. As the sun is expected to consume the earth in about 6 billion years from now, less than 1.5 halflives will have passed by then. Therefore uranium will remain in the environment as long as earth exists, although at slowly decreasing levels.
When two atoms meet and react which parts of their atoms will touch first?
In the normal sense of "react", no parts meet: The nuclei remain distinct but electons may be shared.
How many undecayed M and Ms would remain out of a sample of 600 M and Ms after three half lives?
75
What do a heavy nuclei need to remain stable?
More neutrons than protons.
Cs-137 is produced as a waste product in nuclear fission reactors What fraction remains undecayed after 241.84 years?
The half-life of Cs-137 is 30.08 years, so 0.0038 would remain after 241.84 years.
What fraction of a radioactive nuclei remain after p half lives?
The remainder is 2-p or 0.5p of the original amount.
Will the radioactive property remain in an ionic compound when a metal element is highly radioactive combined with a non-metal element which is non-radioactive?
A radioactive material is radioactive. Period. The atoms of radioactive material have unstable nuclei. If you combine them with other material, the radioactive material will remain unaffected as regards its radioactivity. Recall that radioactivity is related to the instability of atomic nuclei, and the atomic structure of atomic nuclei are (in general) not involved in chemical bonding. Chemical bonding doesn't affect the stability of the nuclei of atoms. If they are unstable, they will remain so whether the atoms are alone or chemically combined with something else.
Why cells should remain small?
Not all calls are small. Slime molds for example have gigantic cells with tens of thousands of nuclei in each.
What element is in a black hole?
It is not expected that elements would survive as such, within a black hole. Gravitational force would crush everything together to the point where no atomic nuclei remain intact.
What happens to a radioactive material over time?
It disintegrates into its daughter nuclei that are much more stabler than the radioactive nuclei. If a sample of radioacictive material is left it will decay into another element over a period of time. Note that complete decay is not possible. A fraction of the original radioactive material will always remain in the sample.
How can helium remain available for use on earth?
It is produced (slowly) by radioactive decay in the Earth's crust (Alpha radiation is helium nuclei). It doesn't react with anything, so when it escapes it remains in the air.
Explain what a cell would look like if it went through all of the stages of the cell cycle except cytokinesis Explain your reasoning?
If a cell went through all levels of the cycle except cytokinesis, it would look different. When a cell goes through cytokinesis, it divides, so if cytokinesis is skipped the cell wouldn't divide and would remain a single cell with multiple nuclei.
When burning a candle is there fission?
No. Burning a candle is a combustion reaction. As with all chemical reactions the energy released comes from the rearrangement of the electron clouds that form chemical bonds. The nuclei of the atoms remain unchanged.
Why are the nuclei of elements with atomic numbers greater than 82 naturally radioactive?
Massive nuclei are unable to remain bound aganst the repulsive force of their protons, which all have positive charge. This also occurs with elements #43 (technetium) and #61 (promethium) which because of their particular nuclear geometry are inherently unstable and radioactive, with the only natural isotopes having half-lives of just over 2 years.
