Unknown element x has four energy levels, five valence electrons, and is a metalloid. what is elements x?

a-si
b-se
c-ge
d-as

Element X is Arsenic (As)

Explanation:

Elements in the periodic table are either metals, non-metals or metalloids.Metals are elements that react by losing electrons to obtain a stable configuration and form cation.Non-metals are those elements that react by gaining electrons to form a stable configuration and form anion.Metalloids are elements in the periodic table that have both metallic and non-metallic properties.Examples of metalloids include Selenium, Arsenic, Boron, etc.Arsenic is a metalloid in period 4 (four energy levels) with five valence electrons.