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Crookes discovered a unknown element with a bright green ray. He then named the element thallium!
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Jj Thomson discovovered the "Cathode Rays" . And how negative and positive ray react to each other!
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First in the Atom history the Greeks had thought that,
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.