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All the elements in their normal state are reactive and unstable.

In order to attain stability i.e. a state of minimum energy, they tend to form ions by loosing or gaining electrons. By doing so, they achieve stable electronic configuration or noble gas configuration.

However, some elements do not form ions. Instead of that, two such atoms share electrons with each other and achieve this noble gas configuration.

At the end, the main reason for attaining a noble gas configuration is to attain max. stability and min. energy.

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