Red ball=oxygen atomYellow ball=hydrogen atom
Wood stick=polar covalent bond
The "stuff" in the photograph is called water molecule and its formula is H2O. The water molecule has a structure of bent or V-Shape although the placement of the 4 electron pairs seems to purpose water molecule as a tetrahedral. However, it still is bent or V- shape because although the placement of the electron pairs determines the structure, the name is based on the positions of the atoms. Thus, it is incorrect to say that the water molecule is tetrahedral. It has a tetrahedral arrangement of electron pairs but not a tetrahedral arrangement of atoms.
The water molecule contains oxygen atom and two hydrogen atoms and the single bond connects two hydrogen to oxygen atom in order to satisfy duet rule for hydrogen atom and octet rule for oxygen atom. There is 2 lone pairs which causes the water molecule to form in bent or V- shape structure. In addition, the angle between electron pairs is 109.5 degree.
