"Mg" is two symbols. If you have 1 Mg Mg, how many flashbulbs could you make?OI doubt whether anyone would write that. If we were writing about magnesium, we would probably write "magnesium", not "Mg". In your example above, I think I would write:"If you have one milligram of magnesium, how many flashbulb could you make?"
When I read "1 Mg Mg", I interpreted it as one megagram of magnesium, not milligram.
