Maganese, Bromide, Molybdemum, Technicium, and Caeseum are all misspelled, with the correct spellings not currently accepted. In addition, the symbol "BI" is shown with the I incorrectly capitalized.
In addition to the above-mentioned spelling issues (can check by using a real periodic table!), there is also one element which has received a three-letter symbol which is not correct as they all should have only two.
Again, sorry. I was rushed while making this quiz. I fixed the three-letter symbol, but I did use a periodic table while making this quiz, but I must have misspelled some by accident. Sorry about that, and I'll fix it as soon as possible.