1. Why MgCl 2 is an inonic bond? According to the electronegativity table, an el
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Question
1. Why MgCl2 is an inonic bond?
According to the electronegativity table, an electronegativity difference between Cl 3.0 and Mg 1.2 is 1.8 and it's between 0.5~1.9 value so I think MgCl2 is a polar covalent bond...
2. who said that..
You should look for electronegativity difference between F (4) and H (1) = 3.0 since the dipole is present on H and F shown in answer. In case of H2B-H, you should consider electronegativity difference between B (2) and H (1) = 1.0 since you are looking for B-H bond and In case of F2B-F electronegativity difference between B (2) and H (4) = 2.0.
But I don't understand... why the electronegativity of hydrogen is 1.0 which is differ to above electronegativity table???
TABLE 1.4 Electronegativity Values and Trends for Some Atoms (Pauling Scale) Electronegativity increases Li Be Na Mg 2.1 Br 3A 4A 5A 6A 7A 1A 2A Li Be 1.0 1.5 Na |Mg 0.9 1.2 3B 4B 5B 6B 7B K?Ca | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn | Ga | Ge | As | Se | Br 2.0 2.5 3.0 3.5 4.0 Al Si P S C 1B 2B | 1.5 | 1.8 | 2.1 | 2.5 | 3.0 0.8 1.0 1.3 1.5 1.6 1.6 1.5 1.8 1.8 1.8 1.9 1.6 1.6 1.8 2.0 2.4 2.8 0.8 1.0 1.2 1.4 1.6 1.8 1.9 2.2 2.2 2.2 1.9 1.7 1.7 1.8 1.9 2.1 2.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.2 2.2 2.2 2.4 1.9 1.8 1.8 1.9 2.0 2.2 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd n Sb Te CsBa La Hf Ta W Re Os IrPt Au HgExplanation / Answer
Nature of the chemical bond not only depends on electronegativity difference but also the other characteristics of elements. In MgCl2, Mg is ready to loose two electrons it is not ready to share the electrons with other elements.
Mg gives two electrons to attain more stable noble gas electronic configuration and form Mg^2+ ion. These two electrons are accepted by two Cl atoms to form two Cl^- ions. Then there is a electrostatic attraction between Mg^2+ ion and Cl^- ion, so ionic bond will be formed. This is because more electropositivity of Mg metal. Almost all the alkali and alkaline earth metals can form ionic compounds with non metals.
In the case of covalent bond electrons are sharing by two atoms. But alkali and alkaline earth metals are not ready to share the electrons with non metals. That is why always they prefer to form ionic bonds rather than covalent bonds.
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