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Answer :
Final answer:
Cesium-135 consists of 195 subatomic particles - 55 protons, 80 neutrons, and 55 electrons.
Explanation:
Cesium-135 is a radioactive isotope of cesium with a half-life of about 2 million years. The number 135 in Cesium-135 refers to the atomic mass number, which is the total number of protons and neutrons in the nucleus of the atom. Cesium (Cs) sits at the 55th position in the periodic table which means it has 55 protons. Subtracting the number of protons from the atomic mass number, we get the number of neutrons, hence Cesium-135 has 80 neutrons (135-55=80). As for electrons, in a neutral atom, the number of electrons equals the number of protons, therefore Cesium-135 has 55 electrons. So overall, Cesium-135 consists of 190 subatomic particles (55 protons + 80 neutrons + 55 electrons).
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