How would you explain this deviation from the general trend?How would you explain this deviation from the general trend?How would you explain this deviation from the general trend?How would you explain this deviation from the general trend?How would you explain this deviation from the general trend?How would you explain this deviation from the general trend?
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Step-by-step explanation:
In general, on moving down the group (13th group) from B to Al, the ionisation enthalpy decreases with increase in atomic size and screening effect as expected. But ${ IE }_{ 1 }$ of Ga is slightly higher (only 2 kj ${{mol}^{-1}}$) than
${ IE }_{ 1 }$of Al. It is due to imperfect shielding of the valence electrons by 3d-electrons.
As a result of this, effective nuclear charge in Ga is slightly more than that of Al. That’s why (${ IE }_{ 1 }$ ) A ,H\ of Ga is slightly more than that of Al.
On moving from In to Tl,∆ i H1 of Tl is larger than that of In. It is due to the fact that effective nuclear charge outweighs the shielding effect of all the electrons present in '4d and 5d-electrons.
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