Consider an isotope of sodium with a mass number of 25.The number of neutrons in this isotope of sodium is ________.
A)11
B)14
C)16
D)25
E)32

Question

Quizplus · Accepted Answer

The mass number (25) of sodium is the sum of the number of protons and neutrons in the nucleus. Since the atomic number of sodium (11) gives the number of protons, the number of neutrons can be calculated by subtracting the atomic number from the mass number. Thus, 25 - 11 = 14 neutrons. Therefore, the correct choice is B.

Consider an Isotope of Sodium with a Mass Number of 25.The