Question

The following compounds contain ions that are required in small amounts by the body. Write the formula for each.

a. calcium chloride

b. nickel(II) iodide

c. manganese(II) oxide

d. zinc nitride

Short answer

The formulas are

(part a)${\mathrm{OH}}^{-}$,

(part b)${\mathrm{PO}}_4^{3-}$,

(part c)${\mathrm{CN}}^{-}$,

(part d)${{\mathrm{NO}}_2}^{-}$

Step-by-step solution

Formula (Part a)

Hydroxide ion is the term given to the${\mathrm{OH}}^{-}$ ion.

Formula (Part b)

Phosphate ion is the term for the ${\mathrm{PO}}_4^{3-}$ion.

Formula (Part c)

The cyanide ion has the formula ${\mathrm{CN}}^{-}$ion.

Formula (Part d)

The formula of ${\mathrm{NO}}_2^{-}$ion is one oxygen atom less than ${\mathrm{NO}}_3^{-}$, nitrate ion. As a result, the nitrite ion is known as ${{\mathrm{NO}}_2}^{-}$ion.