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.
