Why was Mendeleev able to predict the properties of elements which had not yet been discovered?
(1) He was able to predict the properties from the pattern of properties of elements in the same family and period. 4. Do all the properties follow a smooth trend when comparing the elements or compounds in a family? Support your answer using data from your finished chart. (1) The properties follow a general trend but not a smooth trend. For example, the densities in column 2 and column 1 and the melting points in column 11 have irregularities. 5. You have been called in as a highly paid consultant to the Atomic Energy Commision to predict the properties of Element 114. Although this element has not been discovered, nuclear physicists are sure that they can make it some day soon. Your task is to predict as many as you can of the properties of Element 114, which will lie directly underneath the element lead (Pb) on the periodic table. They are paying you for every property you predict, so if not sure, make a good guess.
