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CBSE Class 11-science Answered

it is given that ionisation enthalpy of carbon is more than that of beryylium due to its comparitively small size shouldnt beryllium have higher ionisation enthalpy  due to its fully filled s subshell ???
 
Asked by Viswanath | 15 Aug, 2014, 11:12: AM
answered-by-expert Expert Answer
  • Ionisation energy of Be (Z = 4 1s22s2) is less than that of C (Z = 6 1s22s2 2p2) because the nuclear charge of C is greater than Be and the atomic size of C (77 pm) is smaller than Be (152 pm).
  • Higher the nuclear charge, greater would be the force of attraction between the nucleus and outermost electrons and thus more energy is required to remove the electrons.
  • Hence, the  I.E of C(1088 kJmol-1 ) would be greater than that of Be ( 899 kJmol-1).
Answered by Vaibhav Chavan | 18 Aug, 2014, 11:19: AM

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