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The total number of elements in Groups 10, 11 and 12 of the periodic table is

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answer is D.

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Detailed Solution

The atomic numbers of these elements can be computed as follows

$\begin{array}{llcc} Group 10 & Group 11 & Group 12 \\ 4th period & 2 + 8 + 8 + 10 = 28 & 29 & 30 \\ 5th period & 28 + 18 = 46 & 47 & 48 \\ 6th period & 46 + 32 = 78 & 79 & 80 \end{array}$

The elements in the 7th periods are not discovered yet. So, the number of elements will be equal to 9

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