Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Dinesh khalmaniya 1
Because there is more attractive force between inner orbitals electrons and nucleas so when we remove electrons more energy needed while if outer orbitals electrons jumps into the inner orbitals, due to attractive force energy release