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Group iiia iiia group - PowerPoint PPT Presentation

A German scientist named Johann Dobereiner put forward his law of triads in 1817.

A German scientist named Johann Dobereiner put forward his law of triads in 1817. Each of Dobereiner's triads was a group of three elements. The appearance and reactions of the elements in a triad were similar to each other. At this time, scientists had begun to find out the relative

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Atoms and Periodic Table

Atoms and Periodic Table. Atoms. Atoms are made of protons, neutrons, and electrons. Atomic number. The atomic number (Z) of an element is the number of protons in the nucleus of an atom of that element.

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Group iiia iiia group - PowerPoint PPT Presentation

A German scientist named Johann Dobereiner put forward his law of triads in 1817.

Atoms and Periodic Table