How many radio buttons are typically used per alternative in a Radio Button widget?

In a Radio Button widget, typically only one radio button is used per alternative. This design allows the user to select one option from a set of alternatives, ensuring that only one choice can be selected at any given time. By having a single radio button per option, it visually and functionally represents the concept that each alternative is mutually exclusive. This means that selecting one radio button automatically deselects any previously selected button within the same group, guiding users to make a clear and intentional choice.

Using more than one radio button for a single alternative, such as two or more, would create confusion, as it could imply that multiple selections are permissible for that particular option. This contradicts the fundamental purpose of a radio button in UI design, which is to limit the selection to one option only. Hence, having just one radio button per alternative is critical for clarity and effective user interaction in forms and surveys.