Q. 6.13 - An Introduction to General, Organic, and Biological Chemistry

Question

State the number of proeons and electrons in each of the following ions:

a. ${\mathrm{O}}^{2-}$, ased to huild hiomolecules and water

b. ${\mathrm{K}}^{+}$, most prevaleat positive ion in cells; needed for muscle contraction, nerve impulses

c. $I^{-}$ needed for thyroid function 

d. $N{a}^{+}$, most prevalent positive ion in extracellular fluidffver

Step-by-Step Solution

Answer

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Step 1 : Given information (part a)

• The charge for ${\mathrm{Na}}^{+}$ion is $1+$ but the charge for ${\mathrm{O}}^{2-ion}$  is $2 -$. Two ${\mathrm{Na}}^{+}$ions and one ${\mathrm{O}}^{2-}$ ion are used to balance the charge $2\times (1+)+(2-)=0$.
•  Write the positive ion first, then the negative ion in the ionic formula
• $\mathrm{Na}{}_2\mathrm{O}$ is the correct ionic formula for the compound.

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• The charge for ion is  but the charge for   is . Two ions and one  ion are used to balance the charge .
•  Write the positive ion first, then the negative ion in the ionic formula
•  is the correct ionic formula for the compound.