phet simulation build an atom answer key
U) | 92 | 146 or 147 (U-235, U-238) | 92 | Radioactive isotopes, unstable configurations | Note: For ions, adjust electrons accordingly. For example, a sodium ion (Na⁺) has 11 protons, 12 neutrons, but only 10 electrons. Common Misconceptions Addressed by the Answer Key The a