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

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   the horizontal rows are called periods. the vertical columns are called groups. elements in the same group are similar to each other. the metals are on the left and the non-metals are on the...

2. www.atomicnumber.net › list-of-elements-by-groupList of Elements by Group and Period - Atomic Number

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   List of elements of the periodic table by group and period including the chemical symbol and the atomic number. To list the elements order by group and period, click on the table headers. You can print the list of elements by hitting the print button below. Atomic Number. Chemical Symbol.

3. www.creative-chemistry.org.uk › gcse › keyideasDevelopment of the periodic table - Creative Chemistry

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   Overview. Some key discoveries helped in the development of the periodic table, including: recognising that certain elements have some chemical properties in common. determining accurate atomic weights. realising that there were elements still to be discovered. discovering the significance of proton number and the existence of isotopes.

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

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   The electronic configurations of the elements in group 1: The atoms of all group 1 elements have similar chemical properties and reactions because they all have one electron in their outer...

5. chem.libretexts.org › Courses › Valley_City_State2.3: Families and Periods of the Periodic Table - Chemistry ...

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   Give the name and location of specific groups on the periodic table, including alkali metals, alkaline earth metals, noble gases, halogens, and transition metals. Explain the relationship between the chemical behavior of families in the periodic table and their electron configurations.

6. www.thenational.academy › teachers › programmesDevelopment of the periodic table - Oak National Academy

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   Key learning points. Dalton (1803) arranged known elements in order of atomic weights. Newlands (1865) noticed that every eighth element, in order of atomic mass, repeated similar properties. Mendeleev swapped the order of atomic weights in order to fit elements better into groups of similar properties.

7. People also ask

   How did Dalton and Newlands develop the periodic table?

   • I can describe the development of the periodic table and explain its current form. Dalton (1803) arranged known elements in order of atomic weights. Newlands (1865) noticed that every eighth element, in order of atomic mass, repeated similar properties.

   Development of the periodic table - Oak National Academy

   www.thenational.academy/teachers/programmes/chemistry-secondary-ks4-foundation-aqa/units/atomic-structure-and-the-periodic-table/lessons/development-of-the-periodic-table

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   Why did Mendeleev develop the periodic table?

   • Russian chemist Dimitry Mendeleev developed the periodic table in 1869 after finding that an element’s chemical properties depended on its atomic mass. He realized that certain properties were repeated when the elements were arranged according to their atomic masses.

   Periodic Table: Periods, Groups, and Families - Chemistry Learner

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   Why did Mendeleev put the elements in Group 1A in the same group?

   • The elements in 1A are all very reactive and form compounds in the same ratios with similar properties with other elements. Because of their similarities in their chemical properties, Mendeleev put these elements into the same group. Group 1A is also known as the alkali metals.

   2.3: Families and Periods of the Periodic Table

   chem.libretexts.org/Courses/Valley_City_State_University/Chem_121/Chapter_2:_Atomic_Structure/2.03:_Families_and_Periods_of_the_Periodic_Table

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   Why did Mendeleev's periodic table have gaps?

   • Mendeleev’s periodic table had gaps and he predicted missing elements that were later found. Mendeleev was not aware of isotopes, so was unable to explain why the ordering by atomic weight was not always correct. Pupils often believe that the when the periodic table was devised, scientists knew about the subatomic particles.

   Development of the periodic table - Oak National Academy

   www.thenational.academy/teachers/programmes/chemistry-secondary-ks4-foundation-aqa/units/atomic-structure-and-the-periodic-table/lessons/development-of-the-periodic-table

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8. www.chemistrylearner.com › periodic-table-groupsPeriodic Table: Periods, Groups, and Families - Chemistry Learner

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   Periodic Table Groups. Russian chemist Dimitry Mendeleev developed the periodic table in 1869 after finding that an element’s chemical properties depended on its atomic mass. He realized that certain properties were repeated when the elements were arranged according to their atomic masses.