TRUE OR FALSE? For ionic substances the best way to determine their formula unit is to know the charges on the cation and anion.

To find the formula of an ionic compound, first identify the cation and write down its symbol and charge. Then, identify the anion and write down its symbol and charge. Finally, combine the two ions to form an electrically neutral compound.

To find the ionic charge of an element you'll need to consult your Periodic Table. On the Periodic Table metals (found on the left of the table) will be positive. Non-metals (found on the right) will be negative.

Explanation:

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asking the goog might u get an answer

the answer for sodium is 0.186

the answer for rubidium is 0.251