Question

how does the zig - zag line on the periodic table help indicate properties of elements?
elements located on the right of the metalloid line are liquids at room temperature.
elements located on the left of the metalloid line are liquids at room temperature.
elements located on the left of the metalloid line are good conductors of heat and electricity.

Explanation:

The zig - zag line (metalloid line) on the periodic table separates metals and non - metals. Metals (left of the line) are good conductors of heat and electricity. Non - metals (right of the line) are not necessarily liquids at room temperature. Also, not all metals (left of the line) are liquids at room temperature (most are solids at room temperature).

Answer:

The third statement (Elements located on the LEFT of the metalloid line are good conductors of heat and electricity) is correct.