inorganic ions

Cations + :
Ca2+, Na+, K+, H+, NH4+

calcium, sodium, potassium, hydrogen and ammonium

Anions - :
NO3-, HCO3, Cl-, PO43-, OH-

nitrate, hydrogencarbonate, chloride, phosphate, hydroxide

Inorganic ions involved in water balance:

sodium, potassium, chloride

Inorganic ions involved in bones, teeth, cartilage and exo-skeletons, making things hard and rigid:

calcium and phosphate

Inorganic ions involved in muscle contraction:

calcium, sodium, potassium

Inorganic ions involved in blood:

calcium, sodium, hydrogencarbonate, chloride, phosphate

Inorganic ions involved in transmission of nerve pulses:

calcium, sodium, potassium, chloride

Inorganic ions involved in enzymes/hormones:

calcium, hydrogen, phosphate

Inorganic ions involved in maintaining pH:

sodium, potassium, hydrogen, ammonium, hydrogencarbonate, chloride, phosphate, hydroxide

Inorganic ions involved in photosynthesis/respiration:

potassium, hydrogen, ammonium, hydrogencarbonate, phosphate, hydroxide

Inorganic ions involved in plants:

calcium, potassium, hydrogen, ammonium, nitrate, chloride, phosphate, hydroxide

Inorganic ions involved in plant turgidity:

sodium, potassium, chloride

Inorganic ions involved in cell surface membranes:

calcium, sodium, potassium, hydrogen, chloride, phosphate

Inorganic ions involved in being a component of biological molecules

calcium, hydrogen, ammonium, nitrate, phosphate, hydroxide

Inorganic ions involved in transport:

all except hydroxide

Inorganic ions involved in bodily fluids:

all except ammonium, nitrate and hydroxide