the atomic number of cesium (cs) is 55. if an atom of cesium has 78 neutrons, what is the atomic mass of…
the atomic number of cesium (cs) is 55. if an atom of cesium has 78 neutrons, what is the atomic mass of cesium?
Answer
Explanation:
Step1: Recall atomic - mass formula
Atomic mass = number of protons+number of neutrons
Step2: Identify number of protons
The atomic number is equal to the number of protons. Given atomic number of cesium is 55, so number of protons = 55.
Step3: Calculate atomic mass
Atomic mass = 55 + 78 = 133
Answer:
133