11th Class Chemistry Classification of Elements and Periodicity in Properties

  • question_answer 77)   Ionisation enthalpies of elements of second period are given below : Ionisation enthalpy (kcal\[mo{{l}^{-1}}\]): 520, 899, 801, 1086, 1402, 1314, 1681, 2080 Match the correct enthalpy with the elements and complete the graph given in the following figure. Also symbols of elements with their atomic numbers.

    Answer:

      The second period elements with their symbols, atomic numbers and ionisation enthalpies are given below :  

    Symbol Li Be B C N O F Ne
    At. Number 3 4 5 6 7 8 9 10
    \[\Delta {{H}_{1}}(kJ\,mo{{l}^{-1}})\] 520 899 801 1086 1402 1314 1681 2080
      In a period, the value of ionisation enthalpy increases from left to right with breaks where the atoms have somewhat stable configurations. Be and N have higher values than expected. Be has fully filled orbital while N has half filled orbitals. Be: \[1{{s}^{2}},2{{s}^{2}}\] N : \[1{{s}^{2}},2{{s}^{2}},2p_{x}^{1},2p_{y}^{1}2p_{z}^{1}\] Complete the graph yourself and compare with the graph given in problem 38.

More Questions

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

adversite


You need to login to perform this action.
You will be redirected in 3 sec spinner