CAS12 - ChemActivity 12 Solutions - Electron Spin Exercises...

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ChemActivity 12 Solutions -- Electron Spin Exercises 1. 13 C has a nucleus containing 6 protons and 7 neutrons. Its nuclear charge is therefore +6 and it has a mass of about 13 amu. The atom is neutral because the nucleus is surrounded by 6 electrons distributed among two shells: 1s 2 2s 2 2p 2 . The 1s electrons occupy the shell closest to the nucleus, their spins are pairs (one up and one down), and they have the lowest energy (are the most difficult to remove). The other 4 electrons are valence electrons and are found in the second shell distributed between 2 subshells (s and p). The 2s electrons are spin paired but the 2p electrons are both spinning in the same direction. Therefore, the atom is paramagnetic. The 2s electrons are slightly closer to the nucleus (slightly lower in energy) than the 2p electrons. 2p 2s …¿ 1s …¿ 2. a) True, the oxide ion and the neon atom have the same number of electrons distributed in the same shells and subshells (orbitals). b)
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CAS12 - ChemActivity 12 Solutions - Electron Spin Exercises...

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