Vitamin B12 is a coordination compund with cobalt as its central atom. It contains 4.4 percent cobalt by masss and has a molecular mass of 1.3x10^3 g/mol. How many cobalt atoms are in a molecule of vitamin B12?

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A: ANSWER IS DISCUSSED BELOW

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A:

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A:

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A:

Q: why d-block elements are considered as transition elements. explain

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A:

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