Correct statement for periodic classific...

Correct statement for periodic classification of elements is:

A

All lanthanides and actinides belong to group IIIB

B

All inert gases end at p6 configuration

C

Iron, Cobalt and Nickel have same density so they are classed in VIIIB group together

D

There are 12 naturally occurring radioactive elements in the periodic table

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The correct Answer is:

A

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