You will need to refer to a periodic table for proton values.Atomic mass of all elements (along with the rounded off values) is mentioned in the chart below. In this notation, the atomic number is not included. Symbol-mass format for the above atom would be written as Cr-52. ![]() ![]() For an example of this notation, look to the chromium atom shown below:Īnother way to refer to a specific atom is to write the mass number of the atom after the name, separated by a hyphen. The "A" value is written as a superscript while the "Z" value is written as a subscript. Both the atomic number and mass are written to the left of the chemical symbol. The composition of any atom can be illustrated with a shorthand notation called A/Z format.
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