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Help i need it i don't understand

Help i need it i don't understand
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Help i need it i don't understand

Help i need it i don't understand-example-1
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User Onmylemon
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Answer:

John Newlands: arranged elements according to their atomic mass

Johann Wolfgang Döbereiner: created groups of three elements, each based on similar properties

Antoine Lavoisier: divided elements into four categories

Dmitri Mendeleev: used patterns to predict undiscovered elements

Step-by-step explanation:

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User Rogus
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