Q. Which element is used for radio graphic imaging?

A
Barium
B
Polonium
C
Siver Bromide
D
Tin
Solution:

Barium is a chemical element with symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element.

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