Answer:

Explanation:
<u>Chemical formulas for every compound:</u>
Potassium vapor => 
Molten soldium chloride => 
Molten Potassium chloride => 
Molten Sodium Metal => 
<u>The reaction will be as follows:</u>

This reaction is usually called displacement reaction in which an element displaces another element of a compund.
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The statement that is a part of Kinetic Molecular Theory (KMT) is Molecules in a gas move rapidly. That is option B.
<h3>What is Kinetic Molecular Theory (KMT)?</h3>
Kinetic Molecular Theory (KMT) is defined as the theory that describes the physical behaviour of gases.
The Kinetic Molecular Theory (KMT) include the following:
- Ideal gas molecules are constantly moving;
- They have negligible volume;
- They have negligible intermolecular forces;
- They undergo perfectly elastic collisions; and
- They have an average kinetic energy proportional to the ideal gas's absolute temperature.
Therefore, the statement that is a part of Kinetic Molecular Theory (KMT) is Molecules in a gas move rapidly.
Learn more about gas here:
brainly.com/question/25649765
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Here is a link to a website that explains these observed trends.
https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Book%3A_Introductory_Chemistry_(CK-12)/06%3A_The_Periodic_Table/6.15%3A_Periodic_Trends%3A_Atomic_Radius