In the following sentence, some part may have an error. Identify the part that contains a grammatical or usage error, or select No Error if the sentence is correct: While an electron (1) carries a negative electrical (2) charge, a neutron is neutral. (3) No Error (4).

Introduction / Context:
This error spotting question links basic physics knowledge with English grammar. The sentence compares the charge of an electron with that of a neutron. At the same time, it checks whether the sentence structure, agreement, and usage are correct. You must carefully read each part and decide whether any segment needs correction, or whether the entire sentence is already accurate and clear.

Given Data / Assumptions:

• Sentence parts: While an electron (1) carries a negative electrical (2) charge, a neutron is neutral. (3) No Error (4).• We assume these scientific facts are correct in a basic sense.• We must check grammar, not advanced physics detail.• One option is No Error, which we choose if the sentence is fully correct.

Concept / Approach:
The sentence uses while to introduce a contrast between the properties of an electron and a neutron. The structure While X carries a negative electrical charge, Y is neutral is standard and correct. The verb carries agrees with the singular subject electron, the phrase negative electrical charge is a valid scientific description, and a neutron is neutral is a correct and complete clause. Therefore, no part of the sentence requires grammatical correction.

Step-by-Step Solution:
Step 1: Check part 1 While an electron. The subject an electron and the conjunction while are correctly used to start a contrast clause.Step 2: Check carries a negative electrical in part 2. The verb carries properly agrees with the singular subject electron, and negative electrical naturally leads into charge.Step 3: Check part 3 charge, a neutron is neutral. This part completes the object of carries with charge and then introduces the contrasting clause a neutron is neutral, which is grammatical and meaningful.Step 4: Verify that punctuation and word order are normal and that no article or preposition is missing.Step 5: Since none of the parts 1, 2, or 3 contain a mistake, the correct choice must be No Error.Step 6: Therefore, select option 4.

Verification / Alternative check:
Read the entire sentence smoothly: While an electron carries a negative electrical charge, a neutron is neutral. It is clear, concise, and grammatically standard. It also correctly expresses a basic scientific fact. There is no awkward phrasing or agreement problem. This confirms that the sentence is error free and supports choosing No Error as the answer.

Why Other Options Are Wrong:
Marking option 1 would imply an error in While an electron, but both the conjunction and article usage are fine. Option 2 would suggest a problem in carries a negative electrical, yet the verb and adjectives are correctly used. Option 3 would claim an error in charge, a neutron is neutral, but that segment is properly punctuated and logically completes the contrast. Hence, none of 1, 2, or 3 is correct as the error location.

Common Pitfalls:
Some students doubt scientifically loaded phrases like negative electrical charge and may suspect them without reason. Others may assume that every question must contain an error and hesitate to select No Error even when the sentence is clearly correct. The key is to trust systematic checking: if each segment follows grammar and makes sense, then No Error is the right choice.

Final Answer:
The sentence is grammatically correct in all its parts, so the correct choice is 4 (No Error).