What makes atoms of one element different from the atoms of another element?

Which of the following is a good strategy when it comes to desserts

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?

When rutherford performed his metal foil experiment, he was surprised that most of the alpha particles