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21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
An Intiative by Sri Chaitanya
a
Arrangement of metals according to their nature of oxides and hydroxides.
b
Placing isotopes of known elements in the same place of the original element.
c
Inclusion of inner transition elements.
d
Formation of a new group of noble gases after their discovery.
answer is D.
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