Group 0- noble gases

Question 1

Why is group 0, not called group 8?

Answer 1

Due to the fact that there is one exception, when not all electrons in the outer shell is eight (helium)

Question 2

Why are group 0 elements very unreactive?

Answer 2

They already have a full outer shell so don’t need to gain/lose electrons

Question 3

Properties of noble gases

Answer 3

-Monoatomic, nonmetal molecules (they exist on their own)
-Low density (they are gases) and low boiling points
-They are gases at room temperature
-weak, attractive forces 
-Full outer shell, electrons, (very stable)
-Don’t come bust or readily form compounds with other elements

Question 4

Boiling points, and density: trends down the group

Answer 4

-Boiling point increases down the group
-Intermolecular forces are getting stronger
-Density increases down the group