The element that has 4 energy levels and 2 valence electrons is Beryllium.
What is a Beryllium?
Beryllium is a chemical element that comes in the second row and is an alkaline earth metal.
It is silvery-white, and very brittle at room temperature.
Its properties are similar to aluminum.
It has two valence electrons in the k shell and two in L shell.
Thus, the correct element is Beryllium.
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