Question while-
While researching a topic, a student has taken the following notes:
- Some atoms contain an excess of neutrons.
- Often, these neutrons form a “skin” on the atom’s surface.
- An atom of lead-208 has a neutron skin.
- The thickness of its neutron skin is approximately 0.28 trillionths of a millimeter.
The student wants to emphasize the thickness of lead-208’s neutron skin. Which choice most effectively uses relevant information from the notes to accomplish this goal?
The neutron skin surrounding an atom of lead-208 measures about 0.28 trillionths of a millimeter.
Atoms with excess neutrons will often acquire a neutron skin.
An atom of lead-208, like some other atoms, is surrounded by a neutron skin.
Neutrons surround the surface of an atom of lead-208.
While researching a topic, a student has taken the following notes: Some atoms contain an excess
Medium-difficulty · SAT Reading & Writing · Command of Evidence — Choosing the strongest supporting line or detail. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer explanation
Choice A is the best answer. The sentence emphasizes the thickness of lead-208’s neutron skin, noting that it is about 0.28 trillionths of a millimeter thick.
Choice B is incorrect. The sentence makes a generalization about atoms, stating that atoms with excess neutrons will often acquire a neutron skin; it doesn’t emphasize the thickness of lead-208’s neutron skin. Choice C is incorrect. The sentence states that lead-208 has a neutron skin; it doesn’t emphasize the thickness of that skin. Choice D is incorrect. The sentence indies that lead-208 is surrounded by neutrons; it doesn’t emphasize the thickness of lead-208’s neutron skin.
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