1.2. Isotopes
A subsection of Chemistry, 9701, through 1. Atomic structure
Listing 10 of 34 questions
Iron and cobalt are adjacent elements in the Periodic Table. Iron has three main naturally occurring isotopes, cobalt has one. Explain the meaning of the term isotope. The most common isotope of iron is 56Fe; the only naturally occurring isotope of cobalt is 59Co. Use the Data Booklet to complete the table below to show the atomic structure of 56Fe and of 59Co. A sample of iron has the following isotopic composition by mass. Define the term relative atomic mass. By using the data above, calculate the relative atomic mass of iron to three significant figures. isotope isotope mass 5.84 91.68 2.17 % by mass protons number of neutrons electrons 56Fe 59Co
9701_s05_qp_2
THEORY
2005
Paper 2, Variant 0
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When nuclear reactions take place, the elements produced are different from the elements that reacted. Nuclear equations, such as the one below, are used to represent the changes that occur. U + n 0 → Ba + Kr + 3 n The nucleon number total is constant at 236 and the proton number total is constant at 92. In another nuclear reaction, uranium-238 is reacted with deuterium atoms, H. An isotope of a new element, J, is formed as well as two neutrons. U + H → J + 2 n What is isotope J?
9701_s16_qp_11
MCQ
2016
Paper 1, Variant 1
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Questions Discovered
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