Question

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part a
write a formula for the compound that forms between sodium and chlorite ions.
na₂clo₂
na(clo)₂
naclo₂
naclo₃

Explanation:

Step1: Determine ion charges

Sodium ion is $Na^+$ (charge +1). Chlorite ion is $ClO_2^-$ (charge -1).

Step2: Balance charges

To form a neutral compound, the number of positive and negative charges must be equal. Since $Na^+$ has +1 and $ClO_2^-$ has -1, we need 1 $Na^+$ and 1 $ClO_2^-$ to balance (1×(+1) + 1×(-1) = 0).

Step3: Write the formula

Combine the ions: $Na^+$ and $ClO_2^-$ form $NaClO_2$.

Answer:

$\boldsymbol{NaClO_2}$ (corresponding to the option "NaClO₂")