Lecture Two

Lecture Two - Lecture Two 8/27/10 What determines polarity-...

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Lecture Two 8/27/10 What determines polarity- A function of the structure of the atom. Atom- Smallest unit of matter separable by normal chemical means. The smallest unit of an element, that retains all of the elements properties. An atom is composed of many smaller particles. Particle mass, electric charge: Proton: mass of 1 Dalton, +1 charge Neutron: mass of 1 Dalton, 0 charge Electron: mass of ~0 Dalton, -1 charge Atomic structure: protons and neutrons are located in the nucleus of the atom, with electrons orbiting the nucleus. Atomic Number- the number of protons in an atom. Atomic Mass- the number of protons and neutrons in an atom. (approximately) Isotopes- elements or atoms that have a different number of neutrons (their masses are different) ex- Carbon14 is an isotope of Carbon12. Bohr Model- This model has electrons moving in orbitals or shells around the nucleus. The electrons always try to be in the lowest orbital or energy shell (that is closest to the nucleus). The lowest level (K)- holds two electrons
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This note was uploaded on 09/11/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Fall '07 term at LSU.

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Lecture Two - Lecture Two 8/27/10 What determines polarity-...

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