Which of the following is not a diatomic element?

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Study for the IMAT Chemistry Exam. Access flashcards and multiple choice questions; hints and explanations included for each question. Prepare effectively for your exam.

Multiple Choice

Which of the following is not a diatomic element?

Explanation:
The concept here is that many elements, especially nonmetals, exist as diatomic molecules in their elemental form, meaning two atoms bonded together (like H2, N2, O2). Neon is a monatomic noble gas, so it exists as single atoms rather than pairs. Its outer electron shell is already full, which makes it very stable and unwilling to form bonds under ordinary conditions. In contrast, hydrogen, nitrogen, and oxygen readily form diatomic molecules (H2, N2, O2) to achieve stable electron configurations. So neon is not diatomic, making it the correct choice.

The concept here is that many elements, especially nonmetals, exist as diatomic molecules in their elemental form, meaning two atoms bonded together (like H2, N2, O2). Neon is a monatomic noble gas, so it exists as single atoms rather than pairs. Its outer electron shell is already full, which makes it very stable and unwilling to form bonds under ordinary conditions. In contrast, hydrogen, nitrogen, and oxygen readily form diatomic molecules (H2, N2, O2) to achieve stable electron configurations. So neon is not diatomic, making it the correct choice.

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