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http://www.ed.gov.nl.ca/edu/k12/pub/pg2_periodic_table_ions.pdf

2007-01-15 10:52:33 · answer #1 · answered by romulusnr 5 · 0 0

Because one can determine the charges of all the column 1A-8A elements, and one can fairly easily memorize the charges of the few transition metals that make more than one charge (or you can figure it out from formula or name).

2007-01-15 10:55:08 · answer #2 · answered by teachbio 5 · 0 0

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