C3.1 The Periodic Table and its trends
Throughout this unit candidates will be expected to write word equations for reactions specified.
Higher tier candidates will also be expected to write and balance symbol equations.
The modern periodic table has been developed from work begun by Newlands and Mendeleev.
The trends in chemical properties within the periodic table link to how easily the element gains or loses electrons.
Candidates should use their skills, knowledge and understanding to:
■ evaluate the work of Newlands and Mendeleev to the development of the modern periodic table
■ explain why scientists regarded a periodic table of the elements first as a curiosity, then as a useful tool and finally as an important summary of the structure of atoms.
Knowledge of the history of the periodic table is limited to that specified in the subject content.
Candidates may consider other models, but knowledge is limited to the work of Newlands and Mendeleev.
Examination questions would give information about other models so that comparisons can be made.
Trends within the Periodic Table - Group 1, the alkali metals The elements: ■ are metals with low density (the first three elements in the group are less dense than water) ■ react with non-metals to form ionic compounds in which the metal ion carries a charge of +1.The compounds are white solids that dissolve in water to form colourless solutions ■ react with water, releasing hydrogen ■ form hydroxides Early vs modern Periodic Table - The early Periodic Table Newlands, and then Mendeleev, attempted to classify the elements by arranging them in order of their atomic weights. The list can be arranged in a table so that elements with similar properties are in columns, known as groups. The table is called a periodic table because similar properties occur at regular intervals. The early periodic tables were incomplete and some elements were placed Interactive Periodic Table Game - Interactive Periodic Table game is an excellent way to test your knowledge of the Periodic Table. What’s especially useful is the feature that you can select your own difficulty level. The simulation is produced by ABPI, UK.
Interactive Periodic Table: Explore and Challenge simulation (BP Education)
BP Education. Interactive Periodic Table: Explore and Challenge simultation