Why do the hydrogen atoms of water attach asymmetric?

Answer 1

It has to do with the arrangement of electrons in the oxygen atom. Oxygen has six electrons in its outer shell, which is unstable. To become stable it will tend to gain or share electrons to have a stable outer shell of eight electrons, similar to that of neon. These electrons will form four lobes each with a pair of electrons. The lobes will form a shape similar to a three-sided pyramid, also called a tetrahedron. If the oxygen is taken alone, two of these lobes will contain a single unpaired electron. In a water molecule each of these unpaired lobes will bond with a hydrogen atom. The hydrogen atom will share its single electron with the oxygen to fill this gap. So the two hydrogen atoms in a water molecule represent two corners of a tetrahedron.

Answer 2

Hydrogen atoms in water tend to attach asymmetrically due to the unequal sharing of electrons with the oxygen atom. Oxygen is more electronegative than hydrogen, causing it to pull the shared electrons closer, creating a partial negative charge near the oxygen atom and partial positive charges near the hydrogen atoms. This leads to an asymmetric distribution of charge and gives rise to the unique properties of water.