What does Fajan rule state?
What does Fajan rule state?
Fajans’ rule states that a compound with low positive charge, large cation and small anion has ionic bond where as a compound with high positive charge, small cation and large anion are covalently bonded. Because if this electron cloud of anion is more diffused.
What is fajans rule explain with suitable example?
Fajans’ rules was formulated by Kazimierz Fajans in 1923. Examples: Among metal halides, which compound is the most iconic and the most covalent. Lithium iodide (LiI) is the most covalent and Cesium fluoride (CsF)should be the most ionic.
What is fajans rule class 11th?
The rule says that for cations with same charge and size, the cation with electronic configuration (n−1)dnns0which is found in transition elements have greater covalent character than the cation with electronic configuration ns2np6 which is found in alkali or alkali earth metals.
How is Fajan’s rule related to Polarisation concept?
Explanation: According to Fajan’s rules, the greater the charge the greater is the polarizing power of cation. Explanation: Among cations, Al3+ has smaller size and greater charge hence it has greater polarizing power. Among anions, iodide (I-) is larger and hence can be polarized easily.
What is Fajan’s rule in simple words?
In inorganic chemistry, Fajans’ rules, formulated by Kazimierz Fajans in 1923, are used to predict whether a chemical bond will be covalent or ionic, and depend on the charge on the cation and the relative sizes of the cation and anion.
Which is the correct order of Polarisation?
$\left( 1 \right)$ High charge and small size of the cation. $\left( 2 \right)$ High charge and large size of the anion. Now in the given elements all are cations so the decreasing order of polarizing power is increasing order of the size (atomic radius) of the elements and decreasing order of the charge.
Which is more covalent NaCl or mgcl2?
The covalent character is determined using Fajan’s rule. Covalent characteristics will be more if the size of the cation is small. Therefore, MgCl2 is more covalent than NaCl.
Why CuCl is more covalent than NaCl?
NaCl is an ionic compound whereas CuCl is a covalent compound. Cucl is more covalent than nacl, because cu has a pseudo noble gas structure of the same size as that of na & cucl, because it has 18 electrons in the outermost shell than NaCl, which has 8 electrons.
What is Polarising power Class 11?
The ability of a cation to distort the electron density of anion towards itself or we can say that ability of cation to pull the electron density of anion towards itself is known as Polarizing power. And the tendency by which the anion undergoes polarization is known as Polarizability.
What factors affect Polarizability?
Molecular orientation, atomic radii, and electron density are the main three factors that influence the Polarizability in the following way: As the number of electrons increases, the control on distribution of charge by the nuclear charges becomes less, and thus the Polarizability of atom increased.
Which is more covalent NaCl or NaI?
NaI is the most covalent due to small size of cation and large size of anion. Explanation: Covalent bonds are defined as the bonds which exists due to sharing of electrons between the combining atoms.
What is the correct order of covalent character?
In the given molecules we can see that the anion attached to each molecule is the same i.e. chlorine but cations are different. And the order of electronegativity of the cations is as: Na < Li < Be . So the increasing order of the covalent character will be: NaCl < LiCl < BeCl2. So option B is correct.
What is the meaning of fajan’s rule?
The extent of polarization depends , evidently, on the polarizing power of the cation and the polarizability of the anion. The rules regarding to the polarization, is known as Fajan’s rule . Fajan gave some postulates or condition to explain how does covalent character gradually increase in ionic bond or ionic compounds .
How are Fajans rules used in Inorganic Chemistry?
Fajans’ rules. In inorganic chemistry, Fajans’ rules, formulated by Kazimierz Fajans in 1923, are used to predict whether a chemical bond will be covalent or ionic, and depend on the charge on the cation and the relative sizes of the cation and anion. They can be summarized in the following table:
When did Kazimierz Fajans come up with the rules?
Fajans’ rules. Jump to navigation Jump to search. In inorganic chemistry, Fajans’ rules, formulated by Kazimierz Fajans in 1923, are used to predict whether a chemical bond will be covalent or ionic, and depend on the charge on the cation and the relative sizes of the cation and anion.
What are the rules of Fajans ionic bond?
Fajans’ rules. This produces an ionic bond with covalent character.A cation having inert gas like configuration has less polarising power in comparison to cation having pseudo-inert gas like configuration.