The element with (not yet discovered) will be a/an:

Question

The element with  (not yet discovered) will be a/an:

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Strategy:
 Predict the position of undiscovered elements by extending the periodic table sequence. The filling order following Oganesson (, noble gas) dictates the性质 of element 120.

Step 1: Extend the periodic table
-  (Og) is in Group 18 (Noble gas) of Period 7.
-  will enter the  subshell (Group 1, Alkali metal).
-  will enter the  subshell (Group 2).

Step 2: Classification
Elements in Group 2 are known as Alkaline Earth Metals.

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