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 color-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)