Question

Why actinide are Inner transition element.

Answer 1

Hello matr●︿●

12 group ( llB) element are called inert trasition element because their outrr shell confiquration is (n - 1) d 10 n s 2 since they have completely filled subshells they are less reactive and in other words inert. They are called tranition because they occur in transition series.

Hope it help you!!!

Answer 2

Answer:

Explanation:

(i) Elements placed in two separate rows at the

bottom of the periodic table are called inner

transition elements.

(ii) They include two series of elements: Lanthanide

series and Actinide series. They belong to f-block

elements of Modern Periodic table.

(iii) 14 elements with atomic number 58 to 71

(Cerium to Lutetium) are called lanthanides.

These elements are placed along with lanthanum

(La = 57) in group 3 and period 6 because of very

close resemblance in properties between them.

(iv) 14 elements with atomic number 90 to 103

(Thorium to Lawrencium) are called actinides.

These elements are placed along with actinium

(Ac = 89) in group 3 and period 7 because of very

close resemblance in their properties.

(v) They have last three shells incompletely filled.