Imagine yourself in the shoes of Dimitri Mendeleev. You are provided with two sets of cards that list properties of various elements. These cards resemble the cards used by Mendeleev when he grouped elements. One set of cards lists the names of known elements and their properties, while the other set of cards lists the properties of a few unknown elements. These sets are shown below.

Known Elements Set

K

Physical State: solid
Density: 0.86 g/cm3
Conductivity: good
Solubility (H2O): reacts rapidly
Melting Point: 63oC
I

Physical State: solid
Density: 4.93 g/cm3
Conductivity: very poor
Solubility (H2O): negligible
Melting Point: 113.5oC
Au

Physical State: solid
Density: 19.3 g/cm3
Conductivity: excellent
Solubility (H2O): None
Melting Point: 1064oC
Ge

Physical State: solid
Density: 5.32 g/cm3
Conductivity: fair
Solubility (H2O): none
Melting Point: 937°C
Ba

Physical State: solid
Density: 3.6 g/cm3
Conductivity: good
Solubility (H2O): reacts strongly
Melting Point: 710°C
Ar

Physical State: gas
Density: 0.00178 g/cm3
Conductivity: none
Solubility (H2O): negligible
Melting Point: -189.2°C
Cl

Physical State: gas
Density: 0.00321 g/cm3
Conductivity: poor
Solubility (H2O): slight
Melting Point: -101°C
Rb

Physical State: solid
Density: 1.53 g/cm3
Conductivity: good
Solubility (H2O): reacts violently
Melting Point: 39°C
Ag

Physical State: solid
Density: 10.50 g/cm3
Conductivity: excellent
Solubility (H2O): None
Melting Point: 961°C
Ca

Physical State: solid
Density: 1.57 g/cm3
Conductivity: good
Solubility (H2O): reacts
Melting Point: 845°C
Si

Physical State: solid
Density: 2.33 g/cm3
Conductivity: intermediate
Solubility (H2O): none
Melting Point: 1410°C
Xe

Physical State: gas
Density:3.64 g/cm3
Conductivity: very poor
Solubility (H2O): none
Melting Point: -111.9°C
Unknown Elements Set

Element 1

Physical State : gas
Density : 0.00374 g/cm3
Conductivity: very poor
Solubility (H2O): none
Melting Point: -156.6oC
Element 2

Physical State : solid
Density: 2.54 g/cm3
Conductivity: good
Solubility (H2O): reacts rapidly
Melting Point: 769oC
Element 3

Physical State : solid
Density: 11.54 g/cm3
Conductivity: poor
Solubility (H2O): none
Melting Point: 327.5oC
Element 4

Physical State : gas
Density : 3.12 g/cm3
Conductivity: very poor
Solubility (H2O): negligible
Melting Point: -7.2oC
Element 5

Physical State: solid
Density: 8.96 g/cm3
Conductivity: excellent
Solubility (H2O): none
Melting Point: 1083oC
Element 6

Physical State: solid
Density: 1.87g/cm3
Conductivity: good
Solubility (H2O): reacts violently
Melting Point: 29oC
Part A
Now, using your Periodic Table tool as a reference, type the symbols for the known elements into their appropriate groups and periods in the modified table below. Note that we’re using the international group numbers (1-18), followed by the American scheme for the A-group elements in parentheses