AP EAMCET Engineering 2015 Code C Paper

A: Rubidium is s-block element and it is a chemical element with symbol Rb and atomic number 37.
B: Platinum is a chemical element with symbol Pt and atomic number 78 .
C: Ekasilicon: The name of a hypothetical element predicted and afterwards discovered and named germanium, so-called because it was a missing analogue of the silicon group.
D: Polonium: It is radioactive and belongs to the chalcogen family (oxygen family). Polonium is a chemical element with symbol Po and atomic number 84