As water (H2O) contains both Hydrogen and Oxygen then logically Hydrogen and Oxygen must both be water forming atoms.
Hydrogen and Oxygen forming H2O (two hydrogen atoms for every oxygen atom per molecule)
If I understand you correctly, then the formula for water is H2O. That means for every one oxygen atom, there are two hydrogen atoms. So the answer to you question is: oxygen and hydrogen.
Electron.
is a small atom sticking together forming a semen.
Before the forming of the bond atoms are neutral; after the forming of the bond atoms become cations or anions.
Before the forming of the bond atoms are neutral; after the forming of the bond atoms become cations or anions.
Forming very strong bonds
No water is NOT an "atom". No water is NOT an "element".
Hydrogen bonds are the strongest intermolecular force between water molecules, it occurs between a negatively charged oxgen atom of one water molecule and the positively charged hydrogen atom. This is the strongest inter molecular force there is.
Valence electrons.
Actually the base eg OH group attacks on the alpha Hydrogen atom thus releasing the carbanion and itself forming water. The carbanion further reacts with another aldehyde molecule forming methoxide ion which reacts with water to form aldol product and releases the OH group.
The structure of an atom is very different from when atoms bond.The structure of an atom, is basically the arrangement of the subatomic particles forming the atom. This includes the nucleus, made of protons and neutrons, and the electrons circling the nucleus.When atoms bond together, it is when valence electrons are either taken from another atom or given to another atom to form a bond. Water, for example is a bond. It contains hydrogen and oxygen bonded together. This is where we get H2O. There are two atoms of hydrogen and one atom of oxygen to make the water molecule.