In this notation, the atomic number is not included. 2 × atomic mass of carbon 2 atoms (12.011 amu atom) 24.022 amu 6 × atomic mass of hydrogen 6 atoms (1.0079 amu atom) 6.0474 amu 1 × atomic mass of oxygen 1 atom (15.9994 amu atom) 15.9994 amu. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. B Taking the atomic masses from the periodic table, we obtain. Element Phosphorus (P), Group 15, Atomic Number 15, p-block, Mass 30.974. Symbol-mass format for the above atom would be written as Cr-52. Periodic Table of Videos Created by video journalist Brady Haran working with chemists at The University of Nottingham. There are many ways to find the atomic mass of an element, but the easiest way is to look it up on the periodic table of elements. 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 Molecular mass of an element can be calculated by adding the atomic masses of each of its constituents. The 'A' value is written as a superscript while the 'Z' value is written as a subscript. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Element Magnesium (Mg), Group 2, Atomic Number 12, s-block, Mass 24.305.

Both the atomic number and mass are written to the left of the chemical symbol. Periodic Table of Videos Created by video journalist Brady Haran working with chemists at The University of Nottingham. The composition of any atom can be illustrated with a shorthand notation called A/Z format.

Molar mass on period table