RelativeResourceManager(2) - chemical formulas and when...

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2 of 17 I. ELEMENTS AND IONS A. Oxidation Number and Valence Valence is a term used to describe charge in ions. The valence of an ion can be thought of as the number of hydrogen or hydroxide ions that it will replace or combine within a chemical reaction. For example, two H + will valence or combine with one O 2 to form H 2 O, therefore the O is -2. Similarly, one OH - will combine with Na to form NaOH, thus the valence of Na is +1. For monatomic ions (ions containing only one element), valence is the same as the oxidation number. Some elements like Fe, Cu, N, Mn, C, and S have variable valences. The table below lists elements commonly encountered in soil reactions and their associated symbols, valences, and atomic weights. The information in this table will be useful throughout this course when writing
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Unformatted text preview: chemical formulas and when expressing molar concentrations on a mass basis. Element Symbol Valence(s) Atomic Weights Macronutrients grams per mole Calcium Ca +2 40.1 Magnesium Mg +2 24.3 Potassium K +1 39.1 Phosphorus P +5 31.0 Sulfur S -2, +4, +6 32.1 Nitrogen N -3, +3, +5 14.0 Micronutrients Manganese Mn +2, +4, +7 54.9 Iron Fe +2, +3 55.8 Copper Cu +1, +2 63.5 Zinc Zn +2 65.4 Boron B +3 10.8 Molybdenum Mo +6 95.9 Chlorine Cl -1 35.4 Nickel Ni +2 58.7 Other Elements Carbon C +4, 0, -4 12.0 Hydrogen H +1 1.0 Oxygen O -2 16.0 Sodium Na +1 23.0 Aluminum Al +3 27.0 Silver Ag +1 107.8 Lithium Li +1 6.9...
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