In a group of elements,as the atomic number i | vedclass

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Question

(A) As we move down a group in the periodic table,the atomic number increases. $1$. The atomic radius increases due to the addition of new shells. $2$

Vedclass · Accepted Answer

Ionization energy increases

Vedclass · Answer

(A) As we move down a group in the periodic table,the atomic number increases. $1$. The atomic radius increases due to the addition of new shells. $2$. The ionization energy decreases because the valence electrons are further from the nucleus and more shielded. $3$. Electronegativity decreases as the attraction between the nucleus and shared pair of electrons decreases. $4$. Electron affinity generally decreases as the size of the atom increases,making it harder to add an electron. Therefore,the statement 'Ionization energy increases' is incorrect.

$B$	$801$
$Al$	$577$
$Ga$	$579$
$In$	$558$
$Tl$	$589$

In a group of elements,as the atomic number increases,which of the following is $NOT$ observed?

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The first ionization enthalpy values (in $kJ\,mol^{-1}$) of group $13$ elements are :

$B$ $801$

$Al$ $577$

$Ga$ $579$

$In$ $558$

$Tl$ $589$

How would you explain this deviation from the general trend?

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