What is the nucleon number and the structure of that atom​

Atomic number is the number of electrons or protons present in an atom of an element. Mass number is the total number of protons and neutrons present in an atom of an element. ∴ Nucleon number of C-atoms is 12.

h let me think

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