The accepted value for the density of iron is 7.9 g/mL. Which of the following sets of experimental data for the density of iron is the most precise?
A) Group 1: 7.98 g/mL, 7.85 g/mL
B) Group 2: 7.65 g/mL, 7.64 g/mL
C) Group 3: 7.03 g/mL, 8.54 g/mL
D) Group 4: 5.43 g/mL, 5.47 g/mL

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation:

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).