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

1 Answer
Sep 4, 2017

Answer:

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, #"Og"# (oganesson).

Oganesson
(From Fotolia,com)

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

www.modelscience.com

It is the last element in the #"p"# block, so its electron configuration ends in #"7p"^6#.

Where is element 120?

We use the order of filing atomic orbitals.

Energy levels
(Adapted from Wikibooks)

It shows that the next electrons will go into the #"8s"# orbital.

The #"s"# block is at the left-hand side of the Periodic Table, and the #"8s"# orbital can hold two electrons.

That’s just enough electrons to get us from #"Og"# to element 120.

Periodic Table
(From www.chemicool.com)

You will find it under radium (at. no. 88), so it should be an alkaline earth metal.