1.

Which of thefollowingatomsshould have thehighest1 st electron affinity ?

Answer»

F
O
N
C

Solution :The negativeof electrongainenthalpy is takenaas electronaffinity . Electron affinitieshavepositivevalues. Howeverelementsof GROUP2, 18 and Nhave zerovalues . ThusF hasthe highestelectronaffinityi.e.,option ( a) iscorrect.The actualorderof electronaffinitiesin kJ `mol^(-1)` howeverfollowsthe ORDER :`F (328 ) gt O (141) gt C (122)gt N` (ZERO) .


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