Chapter 18.1, Problem 2R

To determine

To compare: the properties of potassium (K) and iodine (I) with the compound KI.

Explanation of Solution

Introduction:

Potassium is a chemical element with symbol K and it has atomic number 19. The atomic mass of potassium is 39.0983 u. On the other hand, iodine is also a chemical element with the symbol (I) which has atomic number 53. Potassium iodide is denoted by KI and is formed by ionic bonds.

Some of the important properties of potassium (K) are

1. Appearance of Potassium is a shiny and soft. It’s very reactive with water.

2. It is not produced in the body and should be taken in diet.

3. It helps to regulate blood pressure, normal water balance, muscle contraction, PH balance, etc.

Some of the properties of iodine (I) are

1. Appearance of Iodine is the blue and black solid element.

2. It has a pungent and non-pleasant odor.

3. It is the main constituent in the human diet and is required for the proper functioning of the thyroid.

Potassium iodide (KI) is a white solid and is a very important compound to be used in photography and biomedical research purpose. KI is taken as a tablet for treatment against radioactive exposure. Thus, the properties of potassium and iodine are entirely different from the properties of potassium iodide (KI).

Conclusion:

Hence, the properties of potassium and iodine are entirely different from the properties of potassium iodide (KI).