<span>~He was working without prior knowledge toward creating a periodic table of elements that had been done in Europe in the 1860s
~ scandal when he got married to his second wife before he divorced his first wife
~he was working with data that was not very precise (technology didn't exist at the time to make accurate measurements (e.g., weights) for the things he was working on.) Many elements had also not been discovered yet, so he had to guess at a lot of things when making his conclusions. </span>
1. He married his second wife before giving divorce to his first wife. This made him an outsider in the scientific community making it difficult for him to raise funds for the research.
2. Back then there were no precise measuring instruments, so it was difficult for him to measure correct data. Many of the elements were yet to be discovered, so he guessed and by fortune most of his guesses were right.
3.The elements that were not discovered at that time, he left blank spaces for them.
