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Question
A radioactive nucleus X emits an alpha particle followed by two beta particles to form nucleus Y.
- With respect to the element X, where would you position the element Y in the periodic table?
- What is the general name of the elements X and Y?
- If the atomic number of Y is 80 then what is the atomic number of X?
Solution
- `""_("Z")^("A") "X" -> ""_("Z"-2)^("A"-4) "X"_1 + ""_(2)^(4) "He" -> ""_("Z"-1)^("A"-4) "X"_2 + ""_(-1)^(0) "e" -> ""_("Z")^("A"-4) "Y" + ""_(-1)^(0)"e"`
The above shows that X and Y have the same atomic number. Because of this, X and Y will be in the same place in the periodic table. - Isotopes
- When the atomic number of Y is 80 and X and Y are isotopes, the atomic number of X will also be 80.
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