You will create another class PeriodicTable that will contain an array of Element objects and will return information about the elements. This class will also have a method that will calculate the molecular mass of compound substances using information from your array of Element object.
You will create an application class that will ask users what information to return about the chemical elements.
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Have about for years experience in java and are well competent in practical (coding, (unit testing)) and theoretical (Design Patterns, Refactoring). software development