The position of the three elements \( X, Y \) and \( \mathrm{Z} \) in the periodic table are sho...

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The position of the three elements \( X, Y \) and \( \mathrm{Z} \) in the periodic table are shown below:
\( \begin{array}{cc}\text { Group VI } & \text { Group VII } \\ - & - \\ - & \mathrm{X} \\ - & - \\ \text { Y } & \text { Z }\end{array} \)
On the basis of given data, compute the total valence electrons in element X.
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