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 Structure of the atom and the periodic table questions and answers

The electronic structures for elements represented by letters A, B, C and D are
A 2.8.6
B 2.8.2
C 2.8.1
D 2.8.8
(a) Select the element which forms:
(i) A double charged cation
(ii) A soluble carbonate
(b) Which element has the shortest atomic radius?

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