Count the number of neutrons in cesium-130/55 (cs) a. 55 b. 75 c. 130 d. 185

the given element is

¹³⁰₅₅Cs

the superscript - 130 is the atomic mass / mass number

mass number is the sum of protons and neutrons

subscript - 55 is the atomic number

atomic number is the number of protons

therefore we can write the following equations

protons = 55

protons + neutrons = 130

so neutrons = 130 - protons

nuetrons = 130 - 55 = 75

number of neutrons = 75

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