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