The atomic number of cesium (cs) is 55. if an atom of cesium has 78 neutrons, what is the atomic mass of cesium?

The atomic number of cesium (cs) is 55. if an atom of cesium has 78 neutrons, what is the atomic mass of cesium?

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1. camila9022 says:

The atomic number of cesium = 55

So number of electron in cesium = 55

While number of protons in cesium = 55

Atomic mass of cesium= number of protons + number of neutrons

Number of neutrons in cesium is given as 78

Atomic mass of cesium= number of protons + number of neutrons

Atomic mass of cesium=55 + 78

= 133

So, atomic weight of cesium is 133

2. enicole10 says:

Name: Cesium
Symbol: Cs
Atomic Number: 55
Atomic Mass: 132.90546 amu
Melting Point: 28.5 °C (301.65 K, 83.3 °F)
Boiling Point: 678.4 °C (951.55005 K, 1253.12 °F)
Number of Protons/Electrons: 55
Number of Neutrons: 78
Classification: Alkali Metal
Crystal Structure: Cubic
Density @ 293 K: 1.873 g/cm3
Color: silver
British Spelling: Caesium
IUPAC Spelling: Caesium

3. Queiao4088 says:

Atomic mass= number of protons + number of neutrons
$55 + 78 = 133$
hope this helps

4. justinhudson17 says:

133

Explanation: