National League for Nursing (NLN PAX) Practice Exam

Question: 1 / 495

At room temperature, which of the following substances exist as diatomic molecules?

Carbon

Iron

Neon

Oxygen

Diatomic molecules are composed of two atoms of the same or different elements bonded together. At room temperature, certain elements naturally exist as diatomic molecules, and oxygen is one of them.

Oxygen typically occurs in nature as O2, which comprises two oxygen atoms bonded together. This diatomic form is crucial for many biological processes, including respiration in animals and photosynthesis in plants.

In contrast, carbon mainly exists in various allotropes such as graphite and diamond, neither of which is diatomic. Iron typically exists as a solid metallic element and does not form diatomic molecules. Neon is a noble gas and exists as monatomic (single atoms) rather than diatomic.

Thus, the correct identification of oxygen as a diatomic molecule at room temperature highlights its fundamental role in both chemistry and biology.

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