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Question

In the general electronic configuration,
(n2)f114(n1)d01ns2 (where n = 7) the configuration will be of:

A
lanthenides
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B
actinides
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C
transition elements
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D
none
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Solution

The correct option is B actinides
General electronic configuration is given:
(n2)f114(n1)d01ns2,where(n=7)
5f1146d01ns2
The seventh period (n=7) is similar to the sixth period with the successive filling up of the 7s, 5f, 6d and 7p orbitals and includes most of the man-made radioactive elements. This period will end at the element with atomic number 118 which would belong to the noble gas family. Filling up of the 5f orbitals after actinium (Z=89) gives the 5f-inner transition series known as the Actinoid Series.

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