Please answer this question-

Solution:

a)
$C u, A g a n d A u a l l h a v e d^{10} c o n f i g u r a t i o n a n d t h e r e i s o n l y o n e e l e c t r o n f o r m e t a l l i c b o n d i n g . N o w s i z e o f a t o m s o r k e r n e l s i n c r e a s e s d o w n t h e g r o u p . H e n c e, m e t a l l i c b o n d i n g w e a k e n s d u e t o l e s s a t t r a c t i o n o f e l e c t r o n s . H e n c e, t h e o r d e r i s A g < A u < C u$

b)
$M e l t i n g p o i n t o r d e r o f Z n, H g a n d C d a r e a s f o l l o w s - Z n > C d > H g H i g h e r t h e m e l t i n g p o i n t h i g h e r w i l l b e t h e t h e r m a l s t a b i l i t y . H e n c e, t h e o r d e r o f t h e r m a l s t a b i l i t y i s Z n > C d > H g$

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