10-15-07%20-%20Lecture%207%20-%20Chapter%201%2c%20Fund%20CD

10-15-07%20-%20Lecture%207%20-%20Chapter%201%2c%20Fund%20CD...

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A neutral atom becomes a cation when it loses valence electrons In the order np, ns, and (n-1)d A neutral atom becomes an anion when it gains electrons Wants to gain enough electrons until the next noble-gas configuration is reached Ion Configurations Ion Configurations
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Ions Why do metals lose Why do metals lose electrons in their electrons in their reactions? reactions? Why does Mg form Mg Why does Mg form Mg 2+ 2+ ions and not Mg ions and not Mg 3+ 3+ ? ? Why do nonmetals take Why do nonmetals take on electrons? on electrons?
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Ionization Energy Ionization Energy First ionization energy (I 1 ) = energy required to remove an electron from an atom in the gas phase. Mg (g) + 738 kJ g Mg + (g) + e -
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+ 738 kJ A Mg + (g) + e - Mg + (g) + 1451 kJ g Mg 2+ (g) + e - Mg has 12 protons and only 11 electrons. I 2 = energy required to remove an electron from an atom in the gas phase. Ionization Energy
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This note was uploaded on 10/24/2009 for the course CHEM 234234234 taught by Professor Johnson during the Fall '08 term at UCSD.

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10-15-07%20-%20Lecture%207%20-%20Chapter%201%2c%20Fund%20CD...

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