human bio slides

human bio slides - Shell Model Bohr Electron Orbitals First...

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1/28/2011 1 Bohr - Electron Orbitals • Orbitals can hold as many as two electrons. • Atoms differ in the number of occupied orbitals. • Orbitals closest to nucleus (like Mercury) are lower energy and are filled first • Outer orbitals (like Pluto) have higher energy) 1 Shell Model • First shell of calcium: – Lowest energy – Holds 1 orbital with up to 2 electrons • Second shell – 4 orbitals hold up to 8 electrons Third shell – 4 orbitals hold up to 8 electrons 2 CALCIUM 20p+ , 20e - What Determines Whether Atoms Will Interact? Chemical bonding is entirely dependent on the interactions of electrons. The number and arrangement of electrons determines chemical bonding. Most electron shells need eight electrons (4 orbitals) for completion. The first shell just needs two electrons to be stable. 3 http://www.tvdsb.on.ca/Westmin/science/sbioac/bi ochem/react.htm Electron Vacancies • Unfilled shells make atoms likely to react • An atom of hydrogen, carbon, oxygen, or nitrogen all have vacancies in their outer shells 4 CARBON 6p+ , 6e - NITROGEN 7p+ , 7e - HYDROGEN 1p+ , 1e - Chemical Bonds, Molecules, • A chemical bond is a union between two electrons of adjacent atoms . • Shown as a single horizontal line.
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This note was uploaded on 09/21/2011 for the course MOSAIC 0852 taught by Professor Raymondhalnon during the Spring '09 term at Temple.

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human bio slides - Shell Model Bohr Electron Orbitals First...

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