Noble gases have zero electron activity, why?

This is because all of the Noble Gases have complete valence electron shells.  Most elements 'want' to have a complete electron shell with 8 electrons. Since the Noble Gases already have that 'perfect status' then they have an affinity of 0.Affinity is the change in energy of the atom when an electron is added.

Explanation:

your mom.com . : 0000

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

24