Environmental Science: A Global Concern   5/e   Cunningham/Saigo
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Element	Symbol	Atomic Number	Atomic Mass
Hydrogen	H	1	1
Boron	B	5	10.8
Carbon	C	6	12
Nitrogen	N	7	14
Oxygen	O	8	16
Sodium	Na	11	23
Magnesium	Mg	12	24.3
Phosphorus	P	15	31
Sulfur	S	16	32
Chlorine	Cl	17	35.4
Potassium	K	19	39.1
Calcium	Ca	20	40.1
Manganese	Mn	25	54.9
Iron	Fe	26	55.8
Cobalt	Co	27	58.9
Copper	Cu	29	63.5
Zinc	Zn	30	65.4
Molybdenum	Mo	42	95.9

These elements are essential for plant life; each has one or more vital roles. If any one is missing, a plant cannot survive. Atomic number corresponds to the number of protons in the atomic nucleus; atomic mass is the number of protons plus neutrons in each nucleus.

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