SAT Subject Physics Practice Question 312: Answer and Explanation

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Question: 312

8. The symbols used in writing nuclear equations. Atomic nuclei are typically written in the form . Which letter represents the atomic number?

A. The number of protons is Z.
B. The number of neutrons is X.
C. The symbol of the element is X.
D. The number of electrons is A.
E. The mass number is A.

Correct Answer: A


The correct answer is (A). The number of protons and the atomic number are the same quantity. The Z number represents the atomic number.

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