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Atomic Number: 19

Symbol: K

Name: Potassium

Atomic Mass: 39.0983

Number of Protons: 19

Number of Neutrons: 19

Number of Electrons: 19

Energy Level 1: 2

Energy Level 2: 8

Energy Level 3: 8

Energy Level 4: 1

(Unfortunately I can't draw a Bohr or Electron Dot Diagram on . I'm sure you can find one online though.)

Historical Info:

1. Discovered in 1807 in England

2. Discovered by Sir Humphrey Davy

3. It was the first metal separated by electrolysis

Properties/Characteristics

1. Oxidation number of +1

2. Molar mass of 39.0983 g

3. Alkali Metal

4. Low Melting and Boiling Point

5. Low Density

6. Lustrous

7. Good Conductor of Heat and Electricity

8. Highly Reactive

Important Uses

1. Galvanic Cells

2. Vital Mineral for the Human Body

Explanation:

First part can be found on pretty much any periodic table.

Number of protons in atomic number, it's not an isotope so the number of protons and neutrons are equal, the number of electrons is also the same in a single atom.

The number of electrons is 19. The first level can hold a maximum of two, and the rest can hold up to eight. The first three get completely filled up and then there is a remainder of one for the fourth level.

The rest are just general facts.

Hope this helps!

Option (B) is the correct answer.

Explanation:

The chemical energy stored in the bonds of a substance is known as chemical potential energy.

As potential energy is the energy obtained by the position of an object. So, in chemical bonds also energy is present at a particular position. Hence, the name chemical potential energy is given to it.

Thermal energy is defined as the internal energy of an object because of the kinetic energy present within the molecules of the object.

When sum of both potential and kinetic energy is taken together then the energy formed is known as mechanical energy.

So, in the given picture, match-stick is located at a particular position. Therefore, it has chemical potential energy.

Thus, we can conclude that chemical potential energy is represented here.