Which of the following elements is classified as a nonmetal indicated by its symbol?

Nitrogen is classified as a nonmetal due to its position on the periodic table and its distinct properties. Nonmetals are generally characterized by their ability to gain electrons in chemical reactions, poor conductivity of heat and electricity, and higher electronegativities compared to metals. Nitrogen, found in group 15 of the periodic table, shares these nonmetal characteristics. It exists as a diatomic molecule (N2) under standard conditions and is essential for life, playing a crucial role in processes such as the nitrogen cycle.

In contrast, elements like aluminum and silicon are classified as metals and metalloids, respectively. Aluminum is a lightweight metal known for its conductivity and malleability, while silicon has properties of both metals and nonmetals and is primarily used in semiconductor technology. Carbon, although a nonmetal, has a distinct structure with different allotropes, such as graphite and diamond, but its position on the periodic table makes nitrogen a more straightforward example of a nonmetal.