C3: Periodic Table

Hey, here is a document mainly for students taking AQA Triple Science but it may help others too. This has information from the C3 (chemistry) section about the periodic table and the previous periodic tables and how they were classified. I hope this helps you to revise! Please rate and comment on how to improve :D

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C3: The Periodic Table

The periodic table was developed to classify elements before
atomic structure was understood.

It is a powerful aid to understanding the properties and reactions
of the elements.

Early Attempts to Classify the Periodic Table

Newlands, and then Mendeleev, attempted to classify the
elements by arranging them…

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Elements in the same Group have the same number of electrons
in their highest occupied energy level (outer shell).

The trends in reactivity within Groups in the periodic table can be
explained because the higher the energy level:
the more easily electrons are lost
the less easily electrons are gained.…

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The elements in Group 7 of the periodic table (known as
have coloured vapours
consist of molecules which are made up of pairs of atoms
form ionic salts with metals in which the chloride, bromide or
iodide ion (halide ion) carries a charge of ­1
form molecular compounds with…

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Many transition elements have ions with different charges, form
coloured compounds and are useful as catalysts.

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to explain how attempts to classify elements in a systematic way,
including those of Newlands and Mendeleev, have led through
the growth of chemical knowledge to the modern periodic table
· to explain why scientists regarded a periodic table of the
first as a curiosity, then as a useful…

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summary of the structure of atoms.


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