Dielectric classification – definition of elemental dielectrics Elemental dielectrics are dielectrics composed of only one kind of atom (for example, noble gases like helium, neon, argon). Is this statement correct?
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ATrue
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BFalse
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CTrue only at cryogenic temperatures
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DFalse; elemental dielectrics must be diatomic
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ETrue only for metals
Answer
Correct Answer: True
Explanation
Introduction:Dielectrics can be categorized by composition: elemental (single-atom species), molecular (multi-atom molecules), and compound/ceramic solids. This classification helps anticipate polarization mechanisms (electronic, ionic, orientation) and dielectric strength.
Given Data / Assumptions:
- Elemental substance contains one atomic species.
- Examples include noble gases (He, Ne, Ar) and solid elemental insulators such as sulfur in certain phases.
- Focus is on compositional definition, not on phase-dependent properties.
Concept / Approach:
An “elemental dielectric” is indeed a dielectric material made from atoms of a single element. In gases like helium or neon, polarization is entirely electronic; in solids composed of a single element, electronic and lattice contributions may appear, but compositionally they remain elemental. The statement as a definition is therefore correct.
Step-by-Step Solution:
Define elemental: composed of one atomic species.Identify dielectric examples: He, Ne, Ar gases exhibit electronic polarization only.Conclude the given definition is accurate.Verification / Alternative check:
Textbook classifications separate elemental dielectrics from molecular ones like N2, CO2, H2O, and from ionic solids like NaCl or ceramics (Al2O3), confirming the definition.
Why Other Options Are Wrong:
Diatomic or metallic requirements are irrelevant; temperature qualifiers do not alter the compositional definition.
Common Pitfalls:
Confusing “elemental” with “monatomic gas only”; solids composed of a single element may also be dielectrics depending on structure.
Final Answer:
True