Hydrogen is an element, and the smallest form of an element is an atom. If you meant electrons, then 1.
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To answer your question on how many hydrogen atoms are there in caffeine, the scientific answer would be 10 atoms of hydrogen.
There are four atoms of hydrogen in CH4O.
A hydrogen molecule consists of two hydrogen atoms.
Pentyne is CHCCH2CH2CH3. This compound has 8 hydrogen atoms.
Hydrogen peroxide has a higher percentage of hydrogen by mass compared to water. In hydrogen peroxide, each molecule consists of two hydrogen atoms and two oxygen atoms, giving hydrogen a higher percentage by mass compared to water, where each molecule consists of two hydrogen atoms and one oxygen atom.