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The elements with atomic numbers 90 to 103 are known as -
A
d-block elements
B
lanthanides
C
actinides
D
transition elements
Explanation
Elements from 90 to 103 are actinides which shows similar properties to actinium (z = 89) →Elements form atomic no 58 to 71 are lanthanide series which shows similar properties to lanthanum (z = 57) →d-block elements whose last e– filled in d-orbitals are also known as transition series
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