Just a quick correction : Why does an extra oxygen ATOM make… Molecules are formed from atomes.
Water = molecule = H2O
Caustic = molecule = H2O2
Dioxygen = molecule = O2 (wrongly called oxygen as in oxygen we breath)
Dihydrogen = molecule = H2 (wrongly called Hydrogen as in hydrogen in atmosphere)
An atom alone (usually) does not exist in nature as it seeks strong connections with other atoms to form molecules. Different molecules (even if formed from same atoms) have different properties.
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