Chap_1A_Atomic___Lewis_structures__Resonance

Chap_1A_Atomic___Lewis_structures__Resonance - Atomic...

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Unformatted text preview: Atomic Structure Atoms: protons, neutrons, and electrons. The number of protons determines the identity of the element. PeriodicTable: each successive element increases atomic number by 1 (electron). Some atoms of the same element have a different number of neutrons. These are called isotopes. Example: 12 C, 13 C, and 14 C Electronic Structure Electrons: outside the nucleus, in orbitals. Electrons have wave properties. Electron density is the probability of finding the electron in a particular part of an orbital. Orbitals are grouped into shells, at different distances from the nucleus. Atomic Electronic Configurations Aufbau principle: Place electrons in lowest energy orbital first. Pauli exclusion principle: A maximum of two electrons of opposite spin occupy an atomic orbital, which are spin paired. Hunds rule: Equal energy orbitals are half- filled, spins parallel, then filled. Only valence electrons of each atom are energetically accessible for chemical bonds. Lewis Structures C H 4 C H H H H N H 3 N H H H O H 2 O H H H C H H H H N H H H O H !...
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This note was uploaded on 04/17/2008 for the course CHEM 2010 taught by Professor Tessier during the Fall '08 term at Rensselaer Polytechnic Institute.

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Chap_1A_Atomic___Lewis_structures__Resonance - Atomic...

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