Question
Chemistry Question on Modern Periodic Law And The Present Form Of The Periodic Table
Lanthanoids are
A
14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sublevel.
B
14 elements in the sixth period (atomic no. 58 to 71) that are filling 4f sublevel
C
14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevel
D
14 elements in the sixth period (atomic no. 90 to 103) that are filling 4fsub level
Answer
14 elements in the sixth period (atomic no. 58 to 71) that are filling 4f sublevel
Explanation
Solution
Lanthanoids are a series of chemical elements with atomic numbers from 57 to 71.