Which of the following has the largest radius?
ОА. К
O B. K+
O C. Na
O D. Na+

A. K

Explanation:

Radius of an atom is directly propotional to number of shells. Potassium (K) has 4 shells (as it is in period 4) whlie sodium (Na) has 3 shells (as it is in period 3) therfore K > Na.

Cations are always smaller than their parent atoms. so increasing order is

Na+ < Na < K+ < K

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:

answerlinnaeus;