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Milligram-Milliequivalent Conversions and Atomic Weights

By

Susan E. Fielder

, DVM, MS, DACVP (Clinical Pathology), Oklahoma State University

Last full review/revision Oct 2015 | Content last modified Oct 2015
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Milligram-Milliequivalent Conversions and Atomic Weights

Ion

Atomic Weight

Valence

Hydrogen (H)

1

1

Carbon (C)

12

4

Nitrogen (N)

14

3

Oxygen (O)

16

2

Sodium (Na)

23

1

Magnesium (Mg)

24

2

Phosphate (P)a

31

3, 5

Chlorine (Cl)

35.5

1

Potassium (K)

39

1

Calcium (Ca)

40

2

Note: The milliequivalent (mEq) is the unit of measure often used for electrolytes. It indicates the chemical activity, or combining power, of an element relative to the activity of 1 mg of hydrogen. Thus, 1 mEq is represented by 1 mg of hydrogen (1 mole) or 23 mg of Na+, 39 mg of K+, etc.

equation

equation

a As phosphorus, inorganic

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