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  1. Aug 7, 2009 · SELECT SUM(points.points) AS points_all, SUM(points.points * (points.type = 7)) AS points_login FROM user LEFT JOIN points ON user.id = points.user_id GROUP BY user.id

  2. Mendeleev published his first periodic table of the elements in 1869. Learn more on the periodic table in this podcast. Listen to the full series on BBC Sounds. Open Transcript. Features of...

  3. Dec 1, 2023 · The Periodic Table: Structure & Classification. The periodic table is a list of all known elements arranged in order of increasing atomic number, from 1 to 118. In addition to this, the elements are arranged in such a way that atoms with the same number of shells are placed together, and atoms with similar electronic configurations in the outer ...

  4. the main groups are numbered from 1 to 7 going from left to right, and the last group on the right is Group 0. the block in between Group 2 and Group 3 is where the transition metals are...

  5. Mar 22, 2022 · Revision notes on 3.2.1 Group 2 Elements for the OCR A Level Chemistry syllabus, written by the Chemistry experts at Save My Exams.

  6. The periodic table achieved its modern form through the work of the German chemist Julius Lothar Meyer (1830–1895) and the Russian chemist Dimitri Mendeleev (18341907), both of whom focused on the relationships between atomic mass and various physical and chemical properties.

  7. Jun 23, 2021 · A group is a vertical column down the periodic table, while a period is a horizontal row across the table. Both groups and periods reflect the organization of electrons in atoms. Element atomic number increases as you move down a group from top to bottom or across a period from left to right.

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