Answer is: <span>it comes at the right time.
Some of the chemistry discoveries that come in right time (with enough informations, knowledge and right technology to use that discovery) are: </span>Periodic Table of the Elements, discovery of electron, proton, neutron, radioactivity, pasteurization, t<span>he Haber-Bosch process.</span>
2 <span>KOH +1 H3AsO4 →1 K2HAsO4 + 2 H2O</span>
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Answer:
Electrons have negative charge.