Elements having 3 or fewer electrons in the outer energy level are classified as ____________________.

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They classified as metals, but there are a few exceptions, such as helium and boron. They have three or fewer electrons in their outer layer, but are not metals.

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Thanks for the answer, drwls, but because of the exceptions I am not entirely sure if that is correct

To answer this question, we need to understand the concept of electron configuration and the location of electrons in an atom. The outermost energy level of an atom is known as the valence shell, and the number of electrons in this shell determines the chemical properties of an element.

Elements that have 3 or fewer electrons in their outer energy level are classified as "nonmetals". Nonmetals typically have the tendency to gain or share electrons to achieve a stable octet (8 electrons) in their valence shell. This is because having 8 valence electrons provides them with maximum stability, similar to the noble gases.