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An atom has atomic number 92 and mass number 238. Which of these is an isotope
of this atom?
a.235U
92
b.238Th
91
c.92Nb
41
d.92X
235

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sqdancefan

Answer:

  a.  U235

Explanation:

Atomic number 92 is that of Uranium. It naturally occurs in several isotopes:

  U-238, U-235, U-234

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