Question

please explain Q3....

Answer 1

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The image given indicates the filling of electrons in energy shell.

Here Rn is Radon which is a noble gas of atomic number 86.

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The given atomic number is 112 (Copernicium) ..i.e

26 more electrons than Radon..

So
Filling of electrons will be like.
$= > \bf \: Cn = [Rn] \: \: 7 {s}^{2} \: \: 5 {f}^{14} \: \: 6 {d}^{10}$
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NOW,
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Arranging we get,

$\bf \: = > Cn = [Rn] \: \: 5 {f}^{14} \: \: 6 {d}^{10} \: \: 7 {s}^{2}$
Thus it's group is 12...

Since fully filled d- orbital is found in group 12
, similar to Zinc.

Since, The principle Quantum number is 7..

So period is 7.

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Answer 2

I hope it will help you