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The periodic table
· Newlands and Mendeleev, attempted to classify the elements in a
periodic table by arranging them in order of their atomic relative
masses.
· The list can then be arranged in a table so that elements with similar
properties are in columns, known as groups.
· The early periodic tables were incomplete and some elements were
place in inappropriate groups if the strict order of relative atomic
mass was followed. Mendeleev then overcame some of the problems
by leaving gaps for elements that he though had not yet been
discovered.…read more

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The periodic table
· When electrons protons and neutrons were discovered in the early
20th century, the periodic table was the arranged in order of atomic
(proton) numbers.
· When this was done all elements were placed in appropriate groups.
· The modern periodic table can be seen as an arrangement of the
elements in terms of their electronic structures.
· Elements in the same group have the same number of electrons in
their highest occupied energy level (outer shell).…read more

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Trends within the periodic table
· The elements in group 1 are known as the alkali metals:
· They are metals with low density (the first 3 elements in the group
are less dense than water so they will float on the surface of water)
· They will react with non metals to from ionic compounds in which the
metal ion carries a charge of +1
· The compounds are white solids that dissolve in water to form a
colourless solution, (when they react with water they will start to
release hydrogen).
· They will form Hydrocarbons that dissolve in water to give alkaline
solutions
· In group 1, the further down you go the more reactive the element
will become and the lower the boiling point will become.…read more

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Trends with the periodic table continued ...
· The elements in group 7 of the periodic table are known as Halogens
· They react with metals to form ionic compounds in which the halide
ion carries a charge of -1 (which means it has 7 electrons in its outer
most shell)
· In group 7, the further down the group an element is:
· The less reactive the element will become
· The higher the melting and boiling point will be
· A more reactive halogen will displace a less reactive one from a
aqueos solution…read more

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Trends with the periodic table continued
Higher Tier Information
· The trends in reactivity within the groups in the periodic table can be
explained because the higher the energy level of the outer electrons:
· The more easily electrons are lost
· The less easily electrons are gained…read more

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