19 Inner core electrons I Do not participate in bonding Are

19. Inner (core) electrons: I Do not participate in bonding. Are the first electrons that are removed Shield outer electrons from nuclear charge. Are in the highest shell (n) for main group elements. III. IV. (a) II only (b) I and II (c) I and III (d) III and IV (e) I and IV 20. Which pair of ions depicted below has the largest lattice energy?

Solution

Valence electrons participate in bonding and they are first to be removed. So, statement II is wrong.

Outer electrons shield each other from the nuclear charge. So, statement III is also wrong.

So, correct option is E as inner electrons do not participate in bonding and they are in the highest shell for main group elements.