Conversion atom to another One child has claimed to have find a solution to all physical problems. On asking for details, he said that all periodic elements has common components, i.e. electrons, protons, neutrons.
The child has suggested a solution: convert atom to another by adding electron. This way one can get substance like $\ce{H2O, Au, He}$ in abundance.
How can it be done?
I think you are looking for nuclear transmutation which occurs via nuclear reactions or radioactive decay, as explained in the referenced wikipedia page. As you can imagine then, implementation has some important impediments.