Answer :
Final answer:
None of the given options have an atomic number of 66. The atomic number 66 corresponds to the element Dysprosium, not indicated in any of the choices.
Explanation:
The atomic number represents the number of protons present in the nucleus of an atom. It is also identical to the number of electrons in an atom. Given the isotopes Cu-66, Zn-66, Ga-66, the atomic number is indicated by the chemical symbol (Cu for Copper, Zn for Zinc, Ga for Gallium). Hence, none of the isotopes in the options have an atomic number of 66. The element with atomic number 66 is Dysprosium, symbol Dy. Thus, the answer is 'd. None of the above'.
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