Appendix A. List of Geologically Important Elements and the Periodic Table
The following table includes 36 of the geologically important elements, listed alphabetically by their element name, along with their atomic number and the atomic mass of their most stable isotope.
The geologically most important elements are bolded, and the eight main elements of silicate minerals are identified with an asterisk (*).
| Symbol | Name | Atomic No. | Atomic Mass |
| Al* | Aluminum | 13 | 27 |
| As | Arsenic | 33 | 75 |
| Ba | Barium | 56 | 137 |
| Be | Beryllium | 4 | 9 |
| B | Boron | 5 | 11 |
| Cd | Cadmium | 48 | 112 |
| Ca* | Calcium | 20 | 40 |
| C | Carbon | 6 | 12 |
| Cl | Chlorine | 17 | 35 |
| Cr | Chromium | 24 | 52 |
| Co | Cobalt | 27 | 59 |
| Cu | Copper | 29 | 64 |
| F | Flourine | 9 | 19 |
| Au | Gold | 79 | 197 |
| He | Helium | 2 | 4 |
| H | Hydrogen | 1 | 1 |
| Fe* | Iron | 26 | 56 |
| Pb | Lead | 82 | 207 |
| Mg* | Magnesium | 12 | 24 |
| Mn | Manganese | 25 | 55 |
| Mo | Molybdenum | 42 | 96 |
| Ne | Neon | 10 | 20 |
| Ni | Nickel | 28 | 59 |
| N | Nitrogren | 7 | 14 |
| O* | Oxygen | 8 | 16 |
| P | Phosphorus | 15 | 31 |
| Pt | Platinum | 78 | 195 |
| K* | Potassium | 19 | 39 |
| Si* | Silicon | 14 | 28 |
| Ag | Silver | 47 | 108 |
| Na* | Sodium | 11 | 23 |
| Sr | Strontium | 38 | 88 |
| S | Sulfur | 16 | 32 |
| Ti | Titanium | 22 | 48 |
| U | Uranium | 92 | 238 |
| Zn | Zinc | 30 | 65 |
The periodic table is a list of all of the elements arranged in groups according to their atomic configuration. In this table the elements are colour-coded according to their chemical and physical properties.
For an accessible version of the periodic table please see Syngenta Period Table of Elements (http://www.syngentaperiodictable.co.uk/periodic-table.php?keyStage=5)