You will need to refer to a periodic table for proton values. There are seven stable isotopes of mercury ( 80 Hg) with 202 Hg being the most abundant (29.86). In this notation, the atomic number is not included. Rewrite the equation as 80+N 201 80 + N 201. Fill in the known values where N N represents the number of neutrons. The atomic weight of cerium is approximately 30. Since mercury mercury 's atomic number is 80 80, Hg Hg has 80 80 protons. Answer to 11 The atomic weight of the element mercury, in atomic mass units amu, is approximately 200 amu. Symbol-mass format for the above atom would be written as Cr-52. Next, find the atomic number which is located above the element 's symbol. Here's a taste of what to look forward to next time. 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. 's Fred Campbell on the uses and abuses of element number 80, Quick silver, otherwise known as mercury. The 'A' value is written as a superscript while the 'Z' value is written as a subscript.

The numbers of protons and electrons make sense: the atomic number of helium is 2 2 2 2, so any helium atom must have two protons in its nucleus (otherwise, it would be an atom of a different element).

Both the atomic number and mass are written to the left of the chemical symbol. According to the diagram, this helium atom contains two protons, two neutrons, and two electrons. The composition of any atom can be illustrated with a shorthand notation called A/Z format.

Atomic mass number of mercury