How do you explain that has slightly higher energy than , although it occupies lower position in group?

How do you explain that has slightly higher energy than , although it

1.	How do you explain that has slightly higher energy than , although it occupies lower position in group?
Answer» ghtly high energy than because i) The effective nuclear charge is greater in Gallium compared to AL (the ATOMIC number of Ga is higher than atomic number of Al) II) The OUTERMOST electrons or valence electrons are tightly held. Hence Gallium has high ionization energy compared to Al. III) Because of high Ionization energy Gallium is more electronegative compared to Aluminum