what is the differences between inner transitional elemets and outer transitional elements?

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Solution

There are transition elements and inner transition elements. There is nothing called as outer transition elements.

Transition elements Inner transition elements

General electronic configuration-
(n-1)d^1-10ns¹^-2 General electronic configuration-
(n-2)f^1-14(n-1)d^0-1ns^1-2

The d-block elements are called as transition elements. The last electron enters the d-subshell. The f-block elements are called as inner transition elements.
The last electron enters the f-subshell.

There is irregular trend in atomic and ionic radii. There is regular decrease in atomic and ionic radii.

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Transition elements	Inner transition elements
General electronic configuration- (n-1)d^1-10ns¹^-2	General electronic configuration- (n-2)f^1-14(n-1)d^0-1ns^1-2
The d-block elements are called as transition elements. The last electron enters the d-subshell.	The f-block elements are called as inner transition elements. The last electron enters the f-subshell.
There is irregular trend in atomic and ionic radii.	There is regular decrease in atomic and ionic radii.