Identify the "odd one out" from the given sets of elements/species based on their structural features:

Correct Answer: Carbon-14 (¹⁴C) and Nitrogen-15 (¹⁵N)

Subject: chemistry

• Potassium-40 (⁴⁰K) and Argon-40 (⁴⁰Ar)
• Chromium-52 (⁵²Cr) and Iron-52 (⁵²Fe)
• Carbon-14 (¹⁴C) and Nitrogen-15 (¹⁵N)
• Strontium-90 (⁹⁰Sr) and Yttrium-90 (⁹⁰Y)

Explanation: • <b>Key Fact</b> Options A, B, and D are classic examples of Isobars (same mass number, different atomic numbers). • <b>Supporting Detail</b> Carbon-14 and Nitrogen-15 are NOT Isobars because their mass numbers are different (14 and 15). • <b>Related Concept</b> Carbon-14 (6 protons, 8 neutrons) and Nitrogen-15 (7 protons, 8 neutrons) are actually Isotones because they have the same number of neutrons (8). • <b>Why wrong options are wrong</b> Since A, B, and D belong to the 'Isobar' category, C is the odd pair. • <b>Exam Trick</b> Isobar = Same mass (bar/weight). Isotope = Same Protons (atomic no.). Isotone = Same Neutrons. • <b>Additional Info</b> Carbon-14 is a radioactive isotope famously used in Carbon Dating to find the age of fossils.

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