INTRODUCTION

This laboratory exercise consists of two parts: Investigating the periodic table and Investigating isotopes.

PART 1: INVESTIGATING THE PERIODIC TABLE

Dmitri Ivanovich MENDELEEV, a Russian scientist, was able to organize the elements into a system based upon first grouping the known elements by similar properties and then ranking by INCREASING ATOMIC MASS.  Mendeleev was very bold for his time.  His periodic table was such that he could predict elements not yet discovered and give properties of those elements based on the position of the missing element in the periodic table.

In the FIRST PART of this laboratory exercise you will become a scientist in the year 1869.  The known elements are written out on cards with properties of each element.  The goal is to group the cards by oxygen combination properties and then rank the cards by increasing atomic mass.  The final steps will be to expand the table into the periodic table.