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Energy Level ( Read ) | Chemistry | CK-12 Foundation What Are Energy Levels? Energy levels (also called electron shells) are fixed distances from the nucleus of an atom where electrons may be found. Electrons are tiny, negatively charged particles in an atom that move around the positive nucleus at the center. Energy levels are a little like the steps of a staircase. Build an Atom - Atoms | Atomic Structure | Isotope ... - PhET Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test your ideas! PDF Electrons and The Structure of Atoms - Jefferson Academy Chemistry Circle the letter of the term that is used to label the energy levels of electrons. a. atomic orbitals c. quantum b. quantum mechanical numbers d. principal quantum numbers (n) 10. The letter is used to denote a spherical orbital. 11. Label each diagram below p x, p y, or p z. 12. Use the diagram above. Describe how the p x, p y, and p z ......