| Merrie Curie and her teacher turned husband Pierre Curie worked hard to extract radium chloride \[(RaC{{l}_{2}})\] from uranium ore. They succeeded in 1902 after a long struggle. About 0.19 g of \[RaC{{l}_{2}}\] was extracted and its radioactivity was studied. They were awarded by the nobel prize, which they shared it with Henri Becquerel. |
| (i) What are the values shown by Merrie Curie and her husband? |
| (ii) The sequence of stepwise decays of a radioactive nucleus is \[D\xrightarrow{\alpha }{{D}_{1}}\xrightarrow{{{\beta }^{-}}}{{D}_{2}}\] |
| If the nucleon number and atomic number of \[{{D}_{2}}\] are 176 and 71, respectively, then what are the corresponding values of D and\[{{D}_{1}}?\] |
| Justify your answer in each case. |
Answer:
(i) Values shown here are; dedication, hard-working nature, brilliance and cordinal relationship. (ii) The decays can be represented as follows: \[_{72}^{180}D\xrightarrow{_{2}^{4}He}_{70}^{176}{{D}_{1}}\xrightarrow{_{-1}^{0}e}\begin{matrix} 176 \\ 71 \\ \end{matrix}{{D}_{2}}\] Nucleon number of D = 180 Atomic number of D = 72 Nucleon number of \[{{D}_{1}}=176\] Atomic number of \[{{D}_{1}}=70\]
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