QUESTION 3 What is different between an ionic bond and a covalent bond? An ionic bond is a bond between charged atoms, while a c
2 answers:
Answer: Option (a) is the correct answer.
Explanation:
In an ionic bond is defined as the bond formed due to transfer of electron(s) from one atom to another.
An ionic bond will always be formed between a metal and a non-metal.
This is because an atom which loses its valence electrons (metals) acquires a positive charge and another atom which gains the electrons (non-metals) acquires a negative charge.
Hence, these opposite charges strongly gets attracted towards each other forming a strong bond.
Whereas in a covalent bond, there will be sharing of electrons between the combining atoms.
A covalent bond will always be formed between non-metals when they are present in neutral form.
For example, molecules is formed due to sharing of electrons between the two Cl atoms.
Thus, we can conclude that difference between an ionic bond and a covalent bond is that an ionic bond is a bond between charged atoms, while a covalent bond is a bond between neutral atoms.
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Answer:
AlN has highest melting point among given.
Explanation:
As per ionic model, ionic compounds are held together by electrostatic force. The ionic compound having strong electrostatic force will have high melting point.
Electrostatic force is proportional to charge and size of constituent ions.
In case of MgO
Charge on Mg = +2
Charge on O = -2
In case of LiF
Charge on Li = +1
Charge on F = -1
In case of AlN
Charge on Al = +3
Charge on N = -3
In case of RbF
Charge on Rb = +1
Charge on F = -1
In case of CaS
Charge on Ca = +2
Charge on S = -2
As magnitude of electrostatic force is highest in AlN, therefor, it has highest melting point.