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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!

the answer for sodium is 0.186

the answer for rubidium is 0.251

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