150 091 Lecture 3

150 091 Lecture 3 - Commentary on Lecture 3 Sept 2 2008...

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Commentary on Lecture 3 Sept. 2, 2008 Today’s lecture was about the rules governing chemical reactions between atoms. Atoms of all the different chemical elements are built using the same pattern: a central core called the nucleus in which a number of protons reside. Each proton carries a single positive (+) electrical charge. Around this nucleus arranged in shells (akin to the layers in an onion) are a number of electrons each with a single negative (-) electrical charge. Since the number of electrons around the nucleus are equal to the number of protons in the nucleus, the electrical charges neutralize each other and the atom will be electrically neutral. The atoms of the different chemical elements have different numbers of protons in their nucleus and thus they will each have a corresponding number of electrons around their nucleus. Early on it was discovered that you could arrange the known chemical elements in numerical order by the number of protons in the nucleus of the different atoms with atom number 1 having I proton, number 2 having 2 etc. A table of elements arranged in such a fashion has been called the Periodic Table of Elements Fortunately for you in this class the elements most common in living systems are those with 10 or fewer protons in the nucleus and whose electrons are contained in just 2 shells
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150 091 Lecture 3 - Commentary on Lecture 3 Sept 2 2008...

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