An atom of mass number 43, and atomic number 21, consists of ……… protons, ……… neutrons and …….. electrons.
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21 protons and neutrons
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Lorraine is performing an experiment looking at what type of food her dog prefers. She has chosen three types of dog food and presents all three types to her dog for the dog to choose. Each of the three times she has performed this experiment, her dog chooses the high-fat dog food. By performing the experiment multiple times, which aspect of the scientific method is Lorraine following?
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