Answer:
The bond formed between 2 or more elements by sharing of electrons is called covalent bond
- for ex, let's say Carbon, element of group 14 , it requires 4 electrons to complete it's octate
- it's valency is 4, now either it can donate 4 electrons to some other element or gain from others.
- but in both case it requires too much energy
- so, it neither loose the electrons nor gain, it shares its 4 electrons and formed a constant bond
- ex - ccl4, ch4
- Bond formed by sharing of electron - covalent bond
- bond formed by gaining or loosing of electron is ionic bond.