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Atoms are the basic building blocks of all matter. Inside 

an atom includes the three particles known as protons, 

neutrons, and electrons as well as the nucleus which 

is the center part of an atom. Protons and neutrons are 

located in the nucleus while electrons are located in the 

electron cloud outside the nucleus. In the electron 

cloud there are three rings where the first ring holds 

two electrons, the second holds eight electrons, and the 

third holds eight electrons as well. 

There was a man named Carl Wilhelm Scheele. He 

discovered an element in 1774 later to be known on the 

periodic table. Sir Humphry Davy later named it Chlorine 

in 1810. Its name comes from the greek word Khloros 

meaning green.

The image to the left shows the periodic table box for 

Chlorine. The top number represents the atomic 

number. In the middle are the initial letters known as 

the symbol used to identify Chlorine. At the bottom is 

the atomic mass of Chlorine.

To the left shows the Bohr model of the element 

Chlorine. It has 17 protons and 18 neutrons located in 

the nucleus. It has 17 electrons located in the electron 

clouds. 

Chlorine is located in group 17 on period 3 in the periodic 

table. It is the second member of the Halogen family. Its 

physical state at room temperature is a gaseous form. It 

is never found in free form in nature. Its pure form is a 

green yellowish gas. It is obtained from salt and its uses 

are for water purification and bleaches such as Clorox. It 

dissolves when it mixes with water, and it is harmful to 

organisms living in water and soil. It is a highly reactive 

gas, extremely toxic, and causes environmental harm at 

low levels. 2KMnO4 + 16HCl = 2KCl + 2MnCl2 + 5Cl2(g) 

+ 8H20 is used to make a pure sample of the element.    

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