How to locate the position of element with atomic number 120 which is not yet discovered ?

Sep 4, 2017

You use the order of filling orbitals and your knowledge of the Periodic Table to locate Element 120.

Explanation:

The known elements

The last known element in the Periodic Table is Element 118, $\text{Og}$ (oganesson).

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It is in the lower right-hand corner of the Periodic Table, at the end of Period 7 and the bottom of Group 18.

It is the last element in the $\text{p}$ block, so its electron configuration ends in ${\text{7p}}^{6}$.

Where is element 120?

We use the order of filing atomic orbitals.

It shows that the next electrons will go into the $\text{8s}$ orbital.
The $\text{s}$ block is at the left-hand side of the Periodic Table, and the $\text{8s}$ orbital can hold two electrons.
That’s just enough electrons to get us from $\text{Og}$ to element 120.