Which of thefollowingelementswill gainoneelectronmore readily comparison to other elements of theirgroup ?

Which of thefollowingelementswill gainoneelectronmore readily comparis

1.	Which of thefollowingelementswill gainoneelectronmore readily comparison to other elements of theirgroup ?
Answer» S (g ) Na ( g) O ( g) C1( g) Solution :Chlorinehas thehighesttendency to gain one electronbecause by doing goit ACQUIRES the stableelectronic configurationof the nearest noblegas i.e.,argon. S andO BELONG to group16 but thesize ofis muchsmaller thant that of s. Asresultwhen an electron is addedto them the electron - electronrepulsioninthe smaller 2P- subshellof O are comparativelystronger than thosepresent in thebigger3p- subshellofS. ThereforeS hasa highertendencyto gainan electron tham ONa on theother handhas onlyoneelectronin the valenceshelland hencehas astrongtendencyto loseratherthan gainone electron. Thusoptions( a) and(d ) arecorrect.