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Energy—ground state and excited states. The energy associated to an electron is that of its orbital. The energy of a configuration is often approximated as the sum of the energy of each electron, neglecting the electron-electron interactions. The configuration that corresponds to the lowest electronic energy is called the ground state.

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An orbital diagram naturally leads to the writing of an electron configuration. The electron configuration for chromium is: 1s22s22p63s23p64s23d4 The orbital diagram above is formatted in such a manner as to place the various orbital types at different energy levels.

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Experimentally, we observe that its ground-state electron configuration is actually [Kr]5s 1 4d 4. We can rationalize this observation by saying that the electron–electron repulsions experienced by pairing the electrons in the 5 s orbital are larger than the gap in energy between the 5 s and 4 d orbitals.

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Figure 1. Niels Bohr, Danish physicist, used the planetary model of the atom to explain the atomic spectrum and size of the hydrogen atom. His many contributions to the development of atomic physics and quantum mechanics, his personal influence on many students and colleagues, and his personal integrity, especially in the face of Nazi oppression, earned him a prominent place in history. Oct 29, 2015 · its ground state from a(n) a. inner shell. b. excited state. c. n 0 state. d. less energetic state. _____ 6. How many wavelengths of light are represented in the diagram below? a. 1 b. 6 c.7 d. 8 _____ 7. What is the frequency of light whose wavelength is 633 nm? a. 4.74 10 4 Hz b. 4.74 10 2 Hz c. 4.74 1014 Hz d. 4.74 1016 Hz Energy E∞ E 2 E ...

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Phosphorous is [Ne]3s23p3. The 3s electrons are spin paired, but the 3p electrons are not. There are thus 3 unpaired electrons in phosphorous.