Question

The atomic number of cesium (cs) is 55. if an atom of cesium has 78 neutrons, what is the atomic mass of cesium?an atom of tungsten (w) has 74 protons. the atomic mass of tungsten is 183.84. how many neutrons does an atom of tungsten have? round your answer to the nearest whole number.

Answer 1

The atomic mass of cesium is 133 and equates to the sum of its atomic number (protons) and its number of neutrons. Tungsten, which has an atomic mass of 183.84 and 74 protons, has about 110 neutrons.

Step-by-step explanation:

Atomic mass

or mass number of an element is the total number of protons and neutrons in the nucleus of its atom. So, for cesium (Cs) with an atomic number of 55 (which accounts for the protons) and with the addition of the given 78 neutrons, its atomic mass is 133 (55 protons + 78 neutrons = 133). As for tungsten (W), with an atomic mass of 183.84 and with 74 protons, the number of neutrons can be found by subtracting the number of protons from the atomic mass. Rounding to the nearest whole number, tungsten has about 110 neutrons (183.84 atomic mass - 74 protons ≈ 110 neutrons).

Learn more about Atomic Mass Calculations