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 Structure of the atom and the periodic table questions and answers

The table below is part of the periodic table. The letters are not the actual symbols of the elements. Study it answer the questions that follow.
figatom26520201549.JPG
(a) Select an element which is stored in paraffin in the laboratory
(b) How do ionic radii of E and I compare? Explain.

 (2m 20s)
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