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Xe is one of the larger noble gases, and some isotopes of xenon can decay. Xe-135 is one of the radioactive isotopes. How many protons, neutrons, and electrons does Xe-135 possess?

a) 54 protons, 81 neutrons, 54 electrons
b) 54 protons, 81 neutrons, 135 electrons
c) 54 protons, 135 neutrons, 54 electrons
d) 54 protons, 135 neutrons, 135 electrons

Answer :

Final answer:

Xe-135 has 54 protons, 81 neutrons, and 54 electrons, with the number of neutrons calculated by subtracting the atomic number from the mass number. The correct option is a.

Explanation:

The isotope Xenon-135 (Xe-135) has 54 protons, 81 neutrons, and 54 electrons. When atoms are neutral, the number of electrons is equal to the number of protons.

Since the atomic number of Xenon is 54, indicating 54 protons, and the mass number is 135, we determine the number of neutrons by subtracting the atomic number from the mass number: 135 - 54 = 81 neutrons. Therefore, the correct answer is (a) 54 protons, 81 neutrons, 54 electrons.

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