Karen W. answered 10/21/15
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I wasn't sure if you were asking about geographic dimensions of countries, their populations, or the size of their economies. I found some sources for all three.
For surface area, see this site; Argentina ranks 8th.
http://www.geohive.com/earth/area_top50.aspx
For population, see this site; Bangladesh ranks 8th.
http://www.worldometers.info/world-population/population-by-country/
As for economy, there are various ways of answering that question. This site explains:
http://knoema.com/nwnfkne/world-gdp-ranking-2015-data-and-charts
I hope this helps! - Karen