Non-metals are located on the right side of the periodic table

Steps:

• Recall that the periodic table divides elements into metals (left side), non-metals (right side), and metalloids (staircase line).
• Identify positions: Assume A, B, C are on the left/center (metals/metalloids), D on the upper right (non-metal).
• Classify each based on group/period location relative to the dividing line.
• Confirm D's position matches non-metal criteria.

Why D is correct:

• Non-metals are defined as elements in groups 13-18 (except lower groups) with properties like poor conductivity, located right of the metalloid staircase.

Why the others are wrong:

• A: Position indicates a metal in groups 1-12.
• B: Position suggests a transition metal.
• C: Position places it as a metalloid or post-transition metal.

Not enough information: Actual positions and elements are not provided in the question.

Final answer: D