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Enter your answers: 28-1. kg For each of the following problems, type the chemical symbol followed by the mass number (no space). Examples of correct input: C12, He4, Na23. Examples of incorrect input: c12, HE4, Na-23.
28-2a. 28-2b. 28-2c. 28-2d. 28-2e. 28-2f. 28-3a. 28-3b.
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