Not because they are small, but because they have no color.
Say Hydrogen and Oxygen, yes we can see water, but, how did scientists distinguish that there were one oxygen and two hydrogen atoms in it if these elements are invisible to begin with?
In: Physics
When you run electricity though water, bubbles of gas form – and the gas that forms on the negative electrode behaves *very* differently from the gas that forms on the positive electrode. So they must be different substances.
You can collect these two gases and recombine them into water. But *you can only combine them in a very specific proportion:* it’s always 2-to-1. If you use a different ratio, you will have one of the gases left over when you’re done. So there has to be two of *something* combining with each one *something else*.
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