To find the mass defect for uranium-238 several calculations must be made. which is the calculation that should be made first? assume atomic number for uranium-238 is 92. 92 (1.0073) x 92 (1.0087) = 92 (1.0073) x 146 (1.0087) = 146 (1.0073) x 238 (1.0087) = 238 (1.0073) x 238 (1.0087) =
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