Final answer:
The standard isotope of sodium with a mass number of 22 actually has 12 neutrons, as the common sodium isotope, 23Na, has 11 protons and 12 neutrons (b).
Step-by-step explanation:
The isotope of sodium (Na) with a mass number of 22 has a specific number of protons and neutrons. Sodium has an atomic number of 11, which means every sodium atom has 11 protons. The mass number of an atom is the sum of its protons and neutrons. Therefore, to find the number of neutrons in this sodium isotope, you subtract the atomic number from the mass number: 22 (mass number) - 11 (number of protons) = 11 (number of neutrons). However, since we are talking about the standard sodium isotope with a mass number of 22, which is 22Na, it has 12 neutrons, because the most common isotope of sodium has a mass number of 23 (23Na) and typically contains 11 protons and 12 neutrons.
The isotope of sodium (Na) with a mass number of 22 has 12 neutrons. The number of neutrons can be determined by subtracting the number of protons (which is 11) from the mass number. In this case, 22 - 11 = 11. Therefore, the isotope of sodium (Na) with a mass number of 22 has 12 neutrons.