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The first four sucessive ionization ener...

The first four sucessive ionization energies for an element are 6.113, 11.871, 50.908 and 67.0 (in eV) respectively. The number of valence shell electrons is ..........

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`IE_2 and IE_3` are widely separated.
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The sucessive ionisation energy values for an element X are given below: a) 1st ionisation energy= 410 kJ mol^(-1) b)2nd ionisation energy= 820 kJ mol^(-1) c) 3rd ionisation energy = 1100 kJ mol^(-1) d) 4th ionisation energy = 1500 kJ mol^(-1) 5th ionisation energy= 3200 kJ mol^(-1) Find out the number of valence electron for the atom, X:

The energy of an electron moving in n^(th) Bohr's orbit of an element is given by E_(n)=(-13.6)/n^(2)Z^(2)eV//"atom" Here Z = atomic number The graph of E vs Z^(2) will be