Water molecules have a polarity, which allows them to be electrically attracted to other water molecules and other polar molecules by weak chemical bonds known as

  Hydrogen Bonds

Explanation:  Water molecules can be considered as the dipoles as it has having partial positive charge at one end that is on hydrogen and one end is having partial negative charge that is on oxygen.

Thus it has a tendency to show electrostatic forces of attraction towards the other molecules as well.

One water molecule can form 4 hydrogen bonds with 4 other molecule.

Thus these chemical bonds are known as Hydrogen bonds.

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particle   p is an electron and particle q is a neutron