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Roman Numerals for metals

Time
to learn about roman numerals.... Here is a handy clock if you are
unfamiliar with them. Pretty much you need to know 1-7. 1 is represented
with I, five with V and 10 with X. 4 and 6 and 7 is where it gets
tricky. 4 is 1 *before* 5 - so its Roman numeral is IV. 6 is one *after* five so its roman numeral is VI.

Students
also learned how to identify the charges of metals with more than one
oxidation state using Roman numerals. Metals in the D, F, and lower P
get Roman numerals - basically all metals but the S block, Aluminum and
Boron get roman numerals. **The roman numeral tells you the charge.** We
have to use this system because those odd metals can actually be found
in more than one form - some with 2 possible charges - some with more
than four!
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