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Q. Which of the following is not a transition metal?
Answer: Radium
Notes: Transition metal refers to any of the 40 elements in the d-block of the periodic table, which includes groups 3 to 12 on the periodic table. Some of the common transition metals are: Scandium, Titanium, Vanadium, Chromium, Manganese, Iron, Cobalt, Nickel, Copper, Zinc, etc. Radium, the sixth element in group 2 of the periodic table, is an alkaline earth metal.

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