Answer:
Explanation:
Lewis dot structures represent the symbol of an atom we're looking at and the number of valence electrons it has. This number is represented by the sum of dots around the symbol.
- Potassium is in group 1A, this means it only has one valence electron, so we draw K with one dot in its Lewis diagram;
- Argon is in group 8A, this means it has eight valence electrons, so we draw Ar with 8 dots around it in its Lewis diagram;
- Silicon is in group 4A, this means it has four valence electrons, so we draw Si with 4 dots around it in its Lewis diagram;
- Arsenic is in group 5A, this means it has five valence electrons, so we draw As with 5 dots around it in its Lewis diagram.
Those are represented in the image attached below:
<h2>Answer : Option B) Ozone</h2><h3>Explanation :</h3>
The layer of atmosphere which contains a substance(Ozone) that was created from a product of living thins (oxygen) and protects living things (from harmful UV rays).
Oxygen in the atmosphere reacts in presence of UV rays and forms Ozone.
This ozone forms a protective layer around the earth and protects it from harmful UV rays.
Your answer is 1-3-2-4 , grass sand water rock
The estimation of the acidic and the basic character of a solution is called and defined by the pH. The ![\rm [H^{+}]](https://tex.z-dn.net/?f=%5Crm%20%5BH%5E%7B%2B%7D%5D)
concentration of the solution will be 
<h3>What is the pH?</h3>
pH is a measurement of the free hydrogen and hydroxyl ions in the solution of the substance.
It can be calculated as:
![\rm pH = - \rm log[H^{+}]](https://tex.z-dn.net/?f=%5Crm%20pH%20%20%3D%20-%20%5Crm%20log%5BH%5E%7B%2B%7D%5D)
Given,
pH = 3.75
Substituting values in the equation:
![\begin{aligned}\rm 3.75 &= -\rm log[H^{+}]\\\\\rm [H^{+}] &= 10^{-3.75}\\\\&= 1.7782 \times 10^{-4}\end{aligned}](https://tex.z-dn.net/?f=%5Cbegin%7Baligned%7D%5Crm%203.75%20%26%3D%20-%5Crm%20log%5BH%5E%7B%2B%7D%5D%5C%5C%5C%5C%5Crm%20%5BH%5E%7B%2B%7D%5D%20%26%3D%2010%5E%7B-3.75%7D%5C%5C%5C%5C%26%3D%201.7782%20%5Ctimes%2010%5E%7B-4%7D%5Cend%7Baligned%7D)
Therefore, 
is the concentration of the hydrogen ions.
Learn more about pH here:
brainly.com/question/10285267
Well you didn't list the following. So
Primary elements would be the sequence of amino acids
Secondary would be interactions between nearby residues, such as beta sheets and alpha helices
Tertiary would be the overall 3-D structure, including disulfide bonds
Quaternary refers to interactions among polypeptide chains
