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The periodic table _____.

is arranged by atomic mass
was developed by early alchemists
is arranged by the number of protons
is divided into vertical periods and horizontal groups

User Elnigno
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Step-by-step explanation:

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The periodic table _____. is arranged by atomic mass was developed by early alchemists-example-1
User Neuront
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6 votes
Is divided into vertical periods and horizontal groups
User JPero
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