The mass of one atom of each element, in grams, is given by the atomic mass of the element, which is the mass of the atom relative to the mass of a carbon-12 atom. The atomic mass is typically given in atomic mass units (amu), which are defined as 1/12 the mass of a carbon-12 atom.
The atomic mass of an element includes the mass of its protons, neutrons, and electrons. Here are the atomic masses of chromium, molybdenum, and tungsten, in amu:
Chromium: 51.9961 amu
Molybdenum: 95.94 amu
Tungsten: 183.84 amu
To convert the atomic mass to grams, you can multiply the atomic mass in amu by the conversion factor between amu and grams, which is 1.66054 x 10^-24 grams/amu.
Here is the mass of one atom of each element, in grams, including the mass of the electrons:
Chromium: 8.69 x 10^-23 grams/atom
Molybdenum: 1.59 x 10^-22 grams/atom
Tungsten: 3.06 x 10^-22 grams/atom
To determine the mass of one atom of each element without including the mass of the electrons, you can subtract the mass of the electrons from the total mass. The mass of the electrons can be calculated using the formula:
mass of electrons = number of electrons * mass of electron
where the mass of the electron is 9.10938356 x 10^-31 grams.
Here is the mass of one atom of each element, in grams, without including the mass of the electrons:
Chromium: 8.68 x 10^-23 grams/atom
Molybdenum: 1.59 x 10^-22 grams/atom
Tungsten: 3.06 x 10^-22 grams/atom
Note that the mass of the electrons is much smaller than the mass of the protons and neutrons, so the difference in mass between including and not including the electrons is relatively small. However, it is important to consider the mass of the electrons when calculating the mass of an atom with high precision.