Which of the following elements show the given properties? (i) All elements are metals. (ii) Mos...

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Which of the following elements show the given properties?
(i) All elements are metals.
(ii) Most of the elements form coloured ions, exhibit variable valence and paramagnetism.
(iii) Oftently used as catalysts.
(a) Chalcogens
(b) Transition elements
(c) Inner transition elements
(d) Representative elements
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