Characteristics of transition & inner transition element
Answers
•have large charge/radius ratio;
•are hard and have high densities;
•have high melting and boiling points;
•form compounds which are often paramagnetic;
•show variable oxidation states;
•form coloured ions and compounds;
•form compounds with profound catalytic
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.