What is the cause of formation of hydrog...

What is the cause of formation of hydrogen bond?

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When hydrogen is bonded to electronegative element, the electron pair shared between the two atoms is more towards the electronegative element. As a result, the hydrogen atom becomes highly electropositive with respect to electronegative atom. The hydrogen aatom acquires partial positive charge `(delta^+)` and electrongegative acquires partial negative charge `(delta^-)`. This results in eletrostatic force of attraction, shown below:

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