1. Dmitri Mendeleev 1834-1907

2. Mendeleev’s great achievement: Arranging all of the ___________________into groups possessing similar properties. The ____________at that time were identified by their ____________________. Mendeleev’s first sketch of a periodic table of the elements

3. Details of how Mendeleev designed the first Periodic Table of Elements He wrote down information on each __________ on cards. He noticed that the ________________ (we now refer to as the _______________) could be used to rank the elements from lightest to heaviest.

4. Mendeleev noticed that if you looked at their ___________________there was a ___________________, especially if you left spaces where the properties did not fit. He stressed that there was ______________, and that this order would help ___________________not yet discovered. Details of how Mendeleev designed the first Periodic Table of Elements

5. Mendeleev’s table as published in 1869, with many gaps and uncertainties

6. Mendeleev predicted the properties of _________, _________, and _______. Gallium, scandium, and germanium were also found to fit his predictions. There were some discrepancies, but the format of the table is the basis of today’s periodic table. Mendeleev’s table as published in _________. Details of how Mendeleev designed the first Periodic Table of Elements