What are inner-transition elements?

cbse
dandf-blockelements

#1

What are inner-transition elements? Decide which of the following atomic numbers are of the inner-transition elements 29, 59, 74, 95, 102, 104?


#2

Inner-transition elements Refer to text on page 312.
Inner-transition elements include lanthanoids (58-71) and actinoids (90-103). Thus, elements with atomic numbers 59, 95 and 102 are inner-transition elements.