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because multi-charged silver ion (+2) are very uncommon, only found in quite extreme conditions. it's well-understood that silver ion refers to silver(I), not the others. other examples are sodium, zinc, cadmium... other oxidation...

...and so on. As a shorthand device they are also referred to by roman numerals : I, II, III, IV, VI, VII for tonic, supertonic...

You should know that there is no relationship between the charges' in brackets and "transition" or not. This is because of its varible oxidization state. Lead have 3 oxidization states: +2(most common), +4 and -4 If a metal ion have only 1...

I=1,V=5 X=10,L=50,C=100,D=500,M=1000 MCCXXXV=1000+200+30+5=1235 DCCCLXXIII=500+300+50+20+3=873 CMLXXVIII=900(M-C)+70+8=978 DIII=500+3=503 ICCLXVII=199(CC-I)+50+10+7=276

Probably following Roman numeral convention, MMIL may mean 1000+1000+ 50 - 1 = 2049. However, more formal or generally accepted representation for 2049 should be MMXLIX.

... for writing numbers in chinese. ex. 一二三四五 roman numerals was the standard numbering system and method of arithmetic in ancient rome...

...bar above L will represent 50,000, etc. See: http://en.wikipedia.org/wiki/ Roman _ numerals or http://zh.wikipedia.org/wiki/%E7%BD%97%E9%A9%AC...

...壹貳參肆伍陸柒捌玖拾佰仟萬 2008-08-30 20:05:00 補充： for rules of roman numerals : http://en.wikipedia.org/wiki/ Roman _ numeral