Why do atoms combine ?
Atoms combine with each other to form various compounds. The smallest unit of a substance which can exist independently is called a molecule. So, atoms combine with each other to form molecules.
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Why do atoms tend to acquire noble gas configurations ?
W. Kossel and G.N.Lewis (1916) observed that during chemical reactions, atoms of all elements tend to achieve noble gas configurations. Based on this observation, they proposed a theory for the formation of chemical bonds.
How do atoms acquire stable noble gas configuration ?
The atoms in which the outermost shell is completely filled are more stable. The electronic configuration of neon(2,8) is more stable as compared to those of F(2,7) and Na(2,8,1).: atoms of fluorine, and sodium gain stability by acquiring the electronic configuration of the nearest noble gas neon(2,8).