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Question

What is the mass number of a Cesium (Cs) atom that has 78 neutrons?
a. 55
b. 132.9***
c. 133
d. 132
5 years ago

Answers

anonymous
should i round up to 133 or keep it at 132.9?
5 years ago
DrBob222
It isn't 132.9. Mass numbers are ALWAYS WHOLE number.
mass # = # protons + # neutrons.
# protons Cs = 55. That's the atomic number from the periodic table.
# neutrons from the problem is 78.
78 + 55 = ?
5 years ago
raongre
the answer is 133
3 years ago

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