Chlorine Electrons

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  1. Chlorine Electrons In Valence Shell
  2. Chlorine Electrons Protons Neutrons

The number of electrons in an electrically-neutral atom is the same as the number of protons in the nucleus. Therefore, the number of electrons in neutral atom of Chlorine is 17. Each electron is influenced by the electric fields produced by the positive nuclear charge and the other (Z – 1) negative electrons in the atom. The total number of electrons in a chlorine atom is 17, which is also the atomic number of that element. Of those, 7 are outer (aka valence) electrons, having 3 as principal quantum number. The other 10 electrons, having principal quantum number l.

Chlorine Atom vs Chloride Ion

The elements in the periodic table are not stable except the noble gases. Therefore, elements try to react with other elements, to gain the noble gas electron configuration to achieve stability. Likewise, chlorine also has to get an electron to achieve the electron configuration of the noble gas, Argon. All metals react with chlorine, forming chlorides. Except some similarities, Chlorine and chloride has different physical and chemical properties due to the change of one electron.

Chlorine Atom


Chlorine is an element in the periodic table which is denoted by Cl. It is a halogen (17th group) in the 3rd period of the periodic table. The atomic number of chlorine is 17; thus, it has seventeen protons and seventeen electrons. Its electron configuration is written as 1s2 2s2 2p6 3s2 3p5. Since the p sub level should have 6 electrons to obtain the Argon noble gas electron configuration, chlorine has the ability to attract an electron. Chlorine has a very high electro negativity, which is about 3, according to the Pauling scale. The atomic weight of chlorine is 35.453 amu. Under room temperature, chlorine exists as a diatomic molecule (Cl2). Cl2 is a yellow – greenish color gas. Chlorine has a melting point of -101.5 °C and a boiling point of -34.04 °C. Among all the chlorine isotopes, Cl-35 and Cl-37 are the most stable isotopes. In the atmosphere, 35Cl present in 75.77% and 37Cl present in 24.23%. When chlorine gas is dissolved in water, it forms hydrochloric acid and hypochlorous acid, which are highly acidic. Chlorine has all the oxidation numbers varying from -1 to +7.

Chloride Ion

Chloride is the resulted anion when chlorine abstracts an electron from another electropositive element. Chloride is represented by the symbol Cl. Chloride is a monovalent ion with -1 charge. Therefore, it has 18 electrons and seventeen protons. The electron configuration of chloride is 1s2 2s2 2p6 3s2 3p6. Chloride exists in ionic compounds such as sodium chloride, calcium chloride and HCl, which are ionic. Chloride also exists naturally in water sources, and this is the most common anion in the nature. There is a considerable amount of chloride ions in sea water. Chloride ions can participate in conducting electricity through solvents.


What is the difference between Chlorine Atom and Chloride Ion?

• Chloride ion is the reduced form of chlorine atom. Chloride has 18 electrons compared to seventeen electrons of chlorine, and both have seventeen protons. Therefore, chloride has a negative (-1) charge whereas chlorine is neutral.

• Since there is an additional electron in the chloride ion than the atom, the ionic radius differs from the atomic radius of chlorine. With additional electron in the outer shell, chloride ion tends to expand due to the electron repulsion between each other. This causes an increase in ionic radius for chloride than the chlorine atomic radius.

• Chlorine is more chemically reactive than chloride because it is more unstable.

• Chloride has achieved the Argon electron configuration, therefore, stable than the chlorine atom.

• Chloride ion is attracted to positively charged electrodes or other positively charged chemical species, but chlorine does not.

Chlorine Electrons In Valence Shell

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Chlorine Electrons Protons Neutrons

This is sodium chloride, also known as table salt. Most people scientist know that the formula for salt is NaCl. One sodium (Na) atom gives it's electron to one chlorine (Cl) atom. Chlorine then has the eight electrons in its outer shell to make it 'happy'. Sodium is 'happy' because it has now given up its one extra electron.
Chlorine (Cl) can also bond with aluminum (Al). Aluminum has three extra electrons and will easily let the chlorine atoms use them. Because aluminum has three, that means three chlorine atoms can bond. They make the formula AlCl3, also known as aluminum trichloride. Each of the chlorine atoms gets an electron to fill its shell, and the aluminum loses three, giving it a filled shell too (remember, Aluminum has three extra electrons). The name trichloride means three chlorine atoms are involved.

Nitrogen can combine with three chlorine atoms, forming Nitrogen trichloride, or NCl3. Nitrogen shares its electrons with the chlorine atoms, so all of the atoms have their shells filled.
Take a look at the dots around the atoms. All of them now have eight electrons, and a filled outer shell!