Choose the number of CORRECT statement(s) from the following (a) 1st ionisation potential of ‘B’ is higher than that of 'Be'. (b) Electron affinity of  Cl highest in periodic table(c) [Ar] 4s23d3 is the electronic configuration of Mn2+ (d) 2nd ionisation potential of Na > 1st ionisation potential of Na. (e) 1st ionisation potential of N > 2nd ionisation potential of N. (f) Electronegativity of CI> Electronegativity of F. (g) C+ → C2+ change is called 2nd ionisation potential of carbon. (h) Energy is required to convert He → He+ (i) Conversion of O →O2- is exothermic.