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1. chem.libretexts.org › Bookshelves › General_Chemistry7.1: The History of the Periodic Table - Chemistry LibreTexts

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   Apr 12, 2023 · 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 (1834–1907), both of whom focused on the relationships between atomic mass and various physical and chemical properties.

2. www.bbc.co.uk › bitesize › guidesGroups and periods - The periodic table - GCSE Chemistry ...

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   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...

3. www.bbc.co.uk › bitesize › guidesThe periodic table - Edexcel Electronic configurations and ...

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   Mendeleev made an early periodic table. In the modern periodic table, elements are in order of atomic number in periods and groups. Electronic configurations model how electrons are arranged in...

4. www.savemyexams.com › gcse › chemistryMendeleev´s Periodic Table | Edexcel GCSE Chemistry Revision ...

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   Mendeleev’s table had gaps into which he didn’t force an element, rather he left them empty to be filled at a later date when the correct element was isolated. In this way his version of the table allowed him to predict the existence and properties of then-unknown elements.

5. chem.libretexts.org › Courses › Brevard_College3.2: Development of the Modern Periodic Table - Chemistry ...

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   Describe how some characteristics of elements relate to their positions on the periodic table. Distinguish between the A (atomic mass) value and the Z (atomic number) value when viewing the periodic table. Compare and contrast Mendeleev's and Moseley's ordering of the periodic table.

6. chemistry.stackexchange.com › questions › 133155Groups of the periodic table - Chemistry Stack Exchange

   chemistry.stackexchange.com › questions › 133155

   May 5, 2020 · The iron, cobalt, and nickel groups were designated neither A nor B. The Noble Gas Group was originally attached by Ueming to the left side of the periodic table. The group was later switched to the right side and usually labeled as Group VlllA.

7. People also ask

   Why are the a and B groups numbered in the periodic table?

   • The numeration was chosen so that the characteristic oxides of the B groups would correspond to those of the A groups. The iron, cobalt, and nickel groups were designated neither A nor B. The Noble Gas Group was originally attached by Ueming to the left side of the periodic table.

   Groups of the periodic table - Chemistry Stack Exchange

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   Should a 32-column periodic table have a split D-Block?

   • Reger et al. (2010, p. 295) write that “perhaps” the correct shape of the 32-column periodic table shouldfeature a split d-block given the electron configurations of La and Ac, but that “we avoid these structures by splitting the f-block from the rest of the periodic table.

   The location and composition of Group 3 of the periodic table

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   Which table arises from merging three sub-tables?

   • The table that arises from merging their three sub-tables is 16- rather than 18-elements wide. It may be the squarest useful table I have seen (16w x 15h). Landau and Lifshitz are sometimes cited as providing the earliest argument for placing lutetium in group 3.

   The location and composition of Group 3 of the periodic table

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   Why did Mendeleev leave two blanks in his original table?

   • Two of the blanks Mendeleev had left in his original table were below aluminum and silicon, awaiting the discovery of two as-yet-unknown elements, eka -aluminum and eka -silicon (from the Sanskrit eka, meaning “one,” as in “one beyond aluminum”).

   7.1: The History of the Periodic Table - Chemistry LibreTexts

   chem.libretexts.org/Bookshelves/General_Chemistry/Book:_General_Chemistry:_Principles_Patterns_and_Applications_(Averill)/07:_The_Periodic_Table_and_Periodic_Trends/7.01:__The_History_of_the_Periodic_Table

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   Why did Mendeleev leave gaps in his table?

   • He left gaps in his table for what he thought were undiscovered elements, and he made some bold predictions regarding the properties of those undiscovered elements. When elements were later discovered whose properties closely matched Mendeleev’s predictions, his version of the table gained favor in the scientific community.

   3.2: Development of the Modern Periodic Table

   chem.libretexts.org/Courses/Brevard_College/LNC_216_CHE/03:_Atoms_and_the_Periodic_Table/3.02:_Development_of_the_Modern_Periodic_Table

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   What is the difference between a pedagogic table and a designer table?

   • The notion of a chemical table is analogous to Scerri’s idea of a chemistry-end to his continuum of periodic tables. A pedagogic table is one that has been simplified for teaching purposes. A designer table focuses on other matters including aesthetic considerations and the external shape of a periodic table.

   The location and composition of Group 3 of the periodic table

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8. link.springer.com › article › 10The location and composition of Group 3 of the periodic table

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   Sep 24, 2020 · In the modern periodic table, with lanthanum in Group 3, there is a unique, recurring MOS sequence of +2, +3, and +4, up to at least Z = 100 (Fm). This happens for the sets of consecutive elements or horizontal triads (P = period) shown in Table 3 .