To get the most out of your study session, try to answer the questions above without looking at the solutions first. If you missed a question regarding electron configuration, focus your next 20 minutes of study specifically on the and Pauli Exclusion Principle .

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Isotopes are atoms of the same element (same number of protons) that have different numbers of neutrons (different mass numbers). Example: Carbon-12 (⁶ protons, ⁶ neutrons) and Carbon-14 (⁶ protons, ⁸ neutrons). To get the most out of your study