how do you know how to write the formula for potassium dichromate? where does the 07 come from?

Question

aaronq · Answer

i don't think theres a way to know this but by memorization.. I'm pretty sure it's derived experimentally

anonymous · Answer

we had to write the formulas for like 15 different compounds and the last one was potassium dichromate. i would have guessed it was KCr2....i dont see where the 0t at the end comes from @aaronq

anonymous · Answer

oops O7

aaronq · Answer

ate means that it's usually combine with oxygen  e.g. CO3 2- carbonate, ClO4 perchlorate, MnO4 permanganate, NO3 nitrate