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

Short answer

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Step-by-step solution

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.