An atom of ¹¹⁸Xe contains ________ neutrons. A)54 B)172 C)64 D)110 E)118

Question

Quizplus · Accepted Answer

The element ¹¹⁸Xe has atomic number 118 (the last element in the periodic table). Therefore, it has 118 protons in its nucleus. However, the question asks for the number of neutrons, which can be found by subtracting the atomic number from the mass number. The mass number is not given, but we can deduce it by adding up the numbers in the element symbol: 1 sulfur (S) = 32 1 uranium (U) = 238 1 phosphorus (P) = 31 1 xenon (Xe) = 131 Total mass number = 32 + 238 + 1118 + 31 + 131 + (5x1) + (4x0) = 1545. Therefore, the number of neutrons is: neutrons = mass number - atomic number neutrons = 1545 - 118 neutrons = 1427. This corresponds to answer choice C.

An Atom of 118Xe Contains ________ Neutrons

An Atom of ¹¹⁸Xe Contains ________ Neutrons