Select from the following: \[ { }_{6} \mathrm{C},{ }_{8} \mathrm{O},{ }_{10} \mathrm{Ne},{ }_{11...

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Select from the following:
\[
{ }_{6} \mathrm{C},{ }_{8} \mathrm{O},{ }_{10} \mathrm{Ne},{ }_{11} \mathrm{Na},{ }_{14} \mathrm{Si}
\]
(i) Elements that should be present in the same period.
(ii) Elements that should be present in the same group.

Give reason to support your selection in each case.
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