An isotope of iodine (51) is used in the treatment of
All isotopes of an element have
valency,
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Iodine has an electron configuration of [Kr]4d105s25p5, with the seven electrons in the fifth and outermost shell being its valence electrons. iodine valency is -1 because it has 7 electrons in its last shell and it gains one electron to make it stable .
Isotopes of an element have same atomic number but different mass number. Hence, they have same number of electrons. Chemical properties are related to the number of valence electrons. Thus, isotopes have similar chemical properties.
Explanation:
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