Answer: The average valence electron energy (AVEE) of this element =
1014.2 KJ/ mol  or  1.0142mJ/mol.
Explanation:
The average valence electron energy =  (number of electrons in s subshell  x  Ionization energy of that subshell) + (number of electrons in p subshell  x  Ionization energy of that subshell) / total number of electrons in both subshells of the valence shells.
 The 5A elements are non-metals like Nitrogen and Phosphorus with the metallic character increasing as you go down the group, So a new 5A element will have characteristics of its group with 5 valence electron in its outermost shell represented as ns2 np3
Therefore  the average valence electron energy (AVEE) of this element will be calculated as 
 The average valence electron energy = (2 x 1370  kJ/mol + 3 x 777 kJ/mol.) / 5 
2740+2331/ 5 =5071/5
=1014.2 KJ/ mol  or  1.0142mJ/mol.