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Unformatted text preview: You can use the periodic table to predict how many electrons an element will lose or gain when it becomes an ion. For example, here are the most stable ionic charges on monoatomic ions: Group Charge 1A +1 2A +2 7A-1 6A-2 Generally, Aluminum likes to form the cation Al 3+ and Zinc likes to form the cation Zn 2+ . Here is a "rough rule" you can use to figure out how many electrons an element will gain or lose: Elements tend to gain or lose electrons to achieve the same number of electrons as the nearest noble gas. For groups in the middle of the periodic table, it is not as simple. After you learn about quantum mechanics, however, you will have a better idea of how to predict the stable ion charges for these groups. A final note: you will often hear chemists use the term proton interchangeably with hydrogen cation, H + . Can you explain why?...
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