Nursing Entrance Exam Practice Test 2025 – Complete Prep Resource

Question: 1 / 400

At room temperature, which of these substances exists as diatomic molecules?

Carbon

Neon

Oxygen

Oxygen exists as diatomic molecules at room temperature, which means its most stable form under standard conditions is O2, consisting of two oxygen atoms bonded together. This diatomic nature is a characteristic feature of many nonmetals, particularly the group of gases that includes hydrogen, nitrogen, and oxygen.

In contrast, carbon typically exists in various allotropes such as graphite and diamond, which do not form diatomic molecules. Neon is a noble gas that exists as single atoms rather than molecular forms, and iron is a metallic element that forms metallic bonds rather than diatomic molecules. The vapor or gas forms of these substances under normal conditions do not exhibit the diatomic molecular configuration that oxygen does.

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Iron

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