CHEM-UA 125 Chapter Notes - Chapter 8: Electron Configuration, Atomic Orbital, Atomic Number
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5 Jun 2014
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Original periodic table (mendeleev)-- periodic law: when arranged by atomic mass, the elements exhibit a periodic recurrence of similar properties modern periodic table (moseley): arranges the elements by atomic number, not by mass. How does the electron configuration of an element relate to its chemical and physical properties? the distribution of electrons within the levels and sub levels of its atoms. Hund"s rule-- when orbitals of equal energy are available, the electron configuration of lowest energy has the maximum number of unpaired electrons with parallel spins. Group 1: highly reactive metals lose the outer electron when they form ionic compounds with nonmetals all react with water. Group 7a: reactive nonmetals occur as diatomic molecules form ionic compounds with metals in which the ion charge is 1- covalent compounds with hydrogen to make acidic solutions in water covalent compounds with carbon. Trends in atomic size atomic size varies slightly from substance to substance.
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