Question

Which type of bond is related to the number 007?

-ionic

-covalent

-metalic

Answer 1

Ionic bond:

The electrostatic force of attraction between two oppositely charged ions is called the ionic bond.

An ionic bond is formed due to the transfer of electrons from one atom to another.

The atom that loses electrons will form a cation and the atom that gains electrons will form an anion. These oppositely charged ions come closer to each other due to electrostatic force of attraction and thus they form an ionic bond.

An ionic bond is formed between two atoms when their electronegativity difference is greater than 1.7 on Pauling's scale.

In general, an ionic bond is formed between a metal atom and a nonmetal atom.

E.g. NaCl, LiF, MgCl₂ etc.

Covalent bond:

The chemical bond formed between two atoms due to the sharing of electron pair(s) is called the covalent bond.

It is formed between two atoms for which the electronegativity difference is less than 1.7 on Pauling's scale.

In general, two nonmetal atoms form a covalent bond.

E.g. H₂, F₂, HCl, H₂O etc.

Note: The shared pair of electrons, also known as the bond pair, is either formed due to an equal contribution of electrons by each atom participating in the bond formation; or contributed by only one atom. In the latter case, the bond is also known as the coordinate covalent bond or dative bond.

Metallic bond:

It is the attraction between metal atoms in a metallic crystal. It is formed between electropositive metal atoms of same or different elements. It is also considered as highly delocalized covalent bond.

E.g. The metal atoms Na, Cu, Ag, Fe etc. are bound to each other in their crystals by the metallic bond.