How are chemical formulas of binary ionic compounds generally written? a cation on left, anion on right b anion on left, cation on right c roman numeral first, then anion, then cation d subscripts first, then ions?

Cation is written on left side and anion is written on right side.

Chemical formulas of binary ionic compounds are written as by writing a cation on the left side and anion on right side. Cation is the positive charge that is appear on atom when an atom loses its outermost electron whereas anion is the negative charge which is appear on an atom when it accept an electron.

For example, NaCl is an ionic compound in which sodium loses its electron and becomes cation whereas chlorine accepts the electron and becomes anion so we can conclude that cation is written on left side and anion is written on right side.

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 a cation on left, anion on right

Explanation: Binary ionic compounds are compounds formed by a metal and a non metal where a metal loses electron to form positively charged cation and the non metal gains electrons to form negatively charged anion.

The chemical formula of ionic compound is written by writing the cation first and then the anion.

For Example: Binary ionic compound sodium chloride is written as :

where sodium is present as cation and chlorine is present as anion