SATHEE: The dand fblock elements

The dand fblock elements - Result Question 78

####78. Lanthanoids are

[2004]

(a) 14 elements in the sixth period (atomic no. $= 90$ to 103) that are filling $4 f$ sublevel

(b) 14 elements in the seventh period (atomic no. $= 90$ to 103) that are filling $5 f$ sublevel

(d) 14 elements in the seventh period (atomic no. $= 58$ to 71 ) that are filling $4 f$ sub level

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Solution:

(c) Lanthanides are $4 f$ -series elements starting from cerium $(Z = 58)$ to lutetium $(Z = 71)$ . These are placed in the sixth period and in third group.

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The dand fblock elements - Result Question 78

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