Transition and InnerTransition Elements - Result Question 105

####3. The correct order of the first ionisation enthalpies is

(2019 Main, 10 April II)

(a) Mn<Ti<Zn<Ni

(b) Ti<Mn<Zn<Ni

(c) Zn<Ni<Mn<Ti

(d) Ti<Mn<Ni<Zn

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Solution:

  1. The 3d-transition series is

ScTiTCrMnFeCoNiCuZn  Atomic number 21222324252627282930    Outermost 3d24s23d54s23d84s23d104s2  Electronic   Configuration 

In 1st ionisation, one electron will be removed from 4s2 subshell/orbital.

With increase in atomic number (Z), i.e. with increase in number of protons in the nucleus, effective nuclear charge (Z) also increases from Sc to Zn.

IEZ

So, IE order of the given elements will be,

Ti<Mn<Ni<Zn



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