The formula for terbium phosphate is ${TbPO}_{4}$ . The formula for terbium sulphate is:

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${Tb}_{2} {SO}_{4}$

${TbSO}_{4}$

${Tb}_{2} {({SO}_{4})}_{3}$

$Tb {({SO}_{4})}_{2}$

answer is C.

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Detailed Solution

The formula for terbium sulphate is ${Tb}_{2} {({SO}_{4})}_{3}$ .

Three electrons on the atom of terbium can either be removed or shared during a chemical reaction. Terbium's ionic formula is thus ${Tb}^{+ 3}$ . In contrast, sulphate is an ion with the formula ${SO}_{4}^{- 2}$ . When they are coupled, they just swap the charges and turn it into a subscript.

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