"Isotope" Essays and Research Papers

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Chemistry Poster

caused by radiation ISOTOPES QUESTION a) What is an isotope? An isotope is an atom with same number of protons, but differing number of neutrons. Isotopes are different form of single element for example carbon 12 and carbons 14 are both isotopes of carbon one with six neutrons and one with 8 but are with 6 number of protons. b) What is difference between stable and unstable atom? Unstable isotopes can spontaneously undergo changing, transforming them into other isotopes of same or different element...

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elements change at regular rates, into non-radioactive elements. The older a rock is the larger the number of elements. The age of the rock is found by measuring when the element decays. Radio isotopes which are used to calculate the age of rocks have very long half-lifes, one of the most commonly used isotopes for this is uranium 238. Uranium 238: Half life = 4.5 billion years Uranium-238 has half the atoms in any sample will decay in that amount of time. Uranium-238 decays by alpha emission into...

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Half Life Lab

unstable nuclei and how it can be measured; that the exact time that a certain nucleus will decay cannot be predicted; and that it takes a very large number of nuclei to find the rate of decay. Purpose To stimulate the transformation of a radioactive isotope with M&Ms over time and to graph the data and relate it to radioactive decay and half-lives. Materials and Safety Materials * 200 pieces of M&Ms (trademark only) * Shoe Box * Pen/Pencil * Paper Towel Safety- No safety...

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Chemistry Revision

Chemistry Revision F331 Isotopes - atoms with the same atomic number, but different mass numbers 131I - radioactive tracer for thyroid. 99Tc for tumours. Radioisotopes - gamma emitters & short half life - long enough to detect, but not long enough for damage. Beta particles emitters are more useful than alpha particle emitters because they penetrate more and so are more easily detected. Also, less damaging. The half life is the time taken for half the isotope to decay Mass left = initial...

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Tutorial: Atom and Nucleon Number

Symbolic representation 16 39 64 isotope. 20 19 27 21. P+ and Q are isoelectronic with a) b) c) State the nucleon number of the isotope X State the number of protons in P and Q Identity the element P and Q 22. Do you agree with the statements below? If yes, mark () and if no, mark () No. Statement a. b. c. d. e. f. g. Any element can have only 2 isotopes 2 isotopes of an element may not have the same proton number Most elements do not have isotopes Isoelectronic particles must have...

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Leaving Cert Chemistry

There are more elements in the modern periodic table There are no gaps in the modern table The transition elements are listed in a separate block in the modern table Mendeleev included the transition elements amongst the other elements An isotope is an atom of the same element that have different mass numbers due to a different number of neutrons in the nucleus Calculating the average mass Q. A sample of Chlorine is found to consist of 75% Cl-35 and 25% Cl-37. Calculate the average...

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The Half-Life of a Radioisotope

The Half-Life of a Radioisotope CHM 152 Abstract: The half-life of an unknown radioactive isotope was investigated. The activity of the samples through use of a Geiger-Muller counter. The activity was measured for approximately five minutes per sample, and a half-life was calculated by the unknown. The results were calculated to indicate a half-life of 6.65 days of the unknown radioisotope. Introduction: The half-life of a radioisotope is defined as the amount of time necessary for one-half...

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Chemistry Test

mass of 11.0093055 amu. 29) There are 2 isotopes of copper that occur naturally; 63Cu and 65Cu. The 63Cu atoms have a mass of 62.929601 amu and the 63Cu atoms have a mass of 64.927794 amu. What is the percent natural abundance for each isotope? 30) There are 2 isotopes of gallium that occur naturally; 69Ga and 71Ga. The 69Ga atoms have a mass of 68.925581 amu and the 71Ga atoms have a mass of 70.924707 amu. What is the percent natural abundance for each isotope? 31) 32) Study element flashcards...

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C. Neutron D.

the following nuclear reaction:   _______ + A. B. C. D. E. 6. Analysis of a 4.50-mg sample of a newly discovered isotope showed that only 3.25 mg of the isotope remained after 29.6 h. What is the half-life of the isotope? A. 47.6 h B. 53.4 h C. 58.0 h D. 63.0 h E. 71.2 h 7. An atom with 15 protons and 18 neutrons is an isotope of A. argon B. arsenic C. chlorine D. phosphorus E. sulfur 8. The nuclide symbol represents a(n) A. electron B. proton ...

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Nuclear Advancements After the Manhattan Project

Nuclear Advancements After the Manhattan Project When the first atomic bomb was detonated in Alamogordo New Mexico on June 16, 1945, all the scientists involved in the Manhattan Project understood the great destructive power of radio-active isotopes. Although the atomic bomb was a very destructive force our world would not be as good without it. Because of the government funding involved in the project coupled with the need for an atom bomb, much research that otherwise may not have occurred...

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