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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!

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.