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how the reaction between atoms of Ca and Cl takes place. explain in terms of electron arrangement and eletron transfer

how the reaction between atoms of Ca and Cl takes place. explain in terms of electron arrangement and eletron transfer

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1 Answers

Aarti Gupta
askIITians Faculty 300 Points
6 years ago
Calcium is an alkaline earth element.Its atomic number is 20 and configuration is 2,8,8,2.There are 2 valence electrons in calcium.Being an metal,in order to attain noble gas configuration it can donates these electrons and formed Ca2+ ion.Now chlorine having atomic number 17 will have configuration 2,8,7.It needs only 1e- to complete its octet so it takes 1e- donated by Ca and formed Cl-- ion.Another Cl atom also accepts the remaining 1e- of Ca in the same way leading to the formation of calcium chloride(CaCl2) molecule.So when Ca and Cl atoms reacts with each other than an ionic bonding is formed due to the transfer of 2 valence e-s from Ca atom to the 2 Cl atoms and formed CaCl2 molecule.In this way configuration of Ca becomes 2,8,8,like argon and each Cl atom also attains argon like configuration(2,8,8).Thus CaCl2 is an ionic compound.
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