TASK DEFINITION: You are given a sentence and your task is to generate another sentence that supports the given input.
PROBLEM: 1) In writing the formula or in naming the compound, the cation is listed first, and the anion next.

SOLUTION: In naming ternary compounds, the cation is stated first.

PROBLEM: Wings evolved in a bird ancestor that lived in trees.

SOLUTION: The bird ancestor that lived in trees developed wings, which is commonly associated with birds.

PROBLEM: By convention, no subscript is written when a molecule contains only one atom of an element.

SOLUTION:
If only one atom of a specific type is present a subscript is not used.