Question detail
Why does the radius of an atom (≈1×10^-10 m) make it difficult to observe directly with the naked eye?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Atoms and isotopes
Question
Why does the radius of an atom (≈1×10^-10 m) make it difficult to observe directly with the naked eye?
Answer
The radius of an atom is so small—about 0.1 nanometre—that it is far below the resolution limit of the human eye, which can only detect objects several micrometres across. Consequently, atoms cannot be seen directly and require specialised instruments such as electron microscopes.
Explanation
This answer shows understanding of the scale of atomic dimensions and the practical consequence for observation, aligning with the objective of describing atoms as very small particles.
Common mistake
Misinterpreting Atomic Size
Students often think the radius of an atom is 1 × 10⁻¹⁰ m for all elements, ignoring that atomic radius varies with element and bonding environment.
Explain that 1 × 10⁻¹⁰ m is an average value for a typical neutral atom; actual radii differ between elements and depend on factors such as nuclear charge and electron shielding.
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