Someone help me please I need it

A.(nh4)(2co3)is the correct answer 

The correct answer is b) false

Ok so co(g) is not pronoused that. the only clue is that youpronouse it the oppisote way. 

Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.